Multiple ip for same hostname. Then use this name in ssh_config as the Hostname.
Multiple ip for same hostname. Use this setup for simple, round-robin load balancing ↗.
- Multiple ip for same hostname You can have multiple names point to the same IP. I do not have a DC-02 computer. Yes, and no. sites loaded but the individual sites' indices (php) were referring to their css or js in sub-folders, which didn't work. 1 debian 127. Most MTAs' checks for domain and PTR records matching only take place for the hostname presented in the EHLO command of the sending e-mail server, which can naturally be totally different than the domain in the sender address. This is often used if a machine hosts more than one service or if the machine is a web server. 3. If the hostname contains the character sequence ‘%h’, then this will be replaced with the host name specified on the commandline (this is useful for manipulating unqualified names). com with a hosts file? Reason being, Im testing a new site, hosting uses Virtual hosts, so there are multiple domains on the IP address. Currently Application I have a computer with two connections, with ethernet and wifi. MAC addresses are group assigned to manufacturers much like IP addresses are assigned to ISPs, so that's not unlikely if both devices are from the Having two IPs for same hostname -- ping is sticking with the old IP and not trying the new IP. Hey all If there are several computers on the same network and they all have the same hostname. 200. Networks are configured as private, ip addresses have been set and hostnames are assigned. Issue analysis My question is what (and how does it) allows two different websites on the same IP be accessed by two different domains, for example what (and where) is the mechanism that decides www. It's mostly used when a program wants to output some identifier for the system it's running on. I'm trying to loop through all IP address within range (192. I tried making my hosts file look like this, but it didn't work the way I expected: I am trying to get my DHCP server (isc-dhcpd-4. So basically all it does is act as a local "DNS database" which can be used to easily translate a Aug 7, 2014 · The PTR record for a reverse name (eg 7. somesite. host. CNAME Yes, it is and always has been possible to have more than one IP address for a hostname. com, and setup mail for it and another domain domain2. Note that while gethostbyname returns only one mapping (generally the first found So for hostname to IP address mapping, you only get one IP address per hostname (but multiple hostnames could resolve to the same IP address, which is the opposite). It is a "cosmetic" issue because you know that it is the same device (maybe even the same interface). y and from outside with IP w. Host multiple web applications each on a unique IP address. So you really don't need two Ethernet cards, they Client B registers its DNS record with the new IP address received from the DHCP server, which is the same as the record registered to client A. We want to setup in a way incase anyone ping to ABC should also get reply 192. Ask Question Asked 5 years, 3 months It can also be done with anycast IP addresses, where there is just one IP address, but it routes to multiple different physical computers, depending on where you are in the world, but this is trickier to set With the new toolkit, it is as easy as with the old to add new ip addresses: ip addr add 192. st answer is correct. Homegroup or Workgroup through Windows, I just set the server up with a static local IP Address (x. Limitations. 10 address. Your second example would even be completely useless because only one entry would be used. 2. This can be used to specify nicknames or abbreviations for hosts. conf. More than likely this is due to a computer being on wireless and lan at the same time, or have two lans, or the ip renewed or changed before the old lease expired. So, I would like to know what does more than one IP address signify? Also, I would like to understand how I have two ingress rules (for public/internal traffic), what I would like is for all endpoints to use the public ingress except for /metrics, which should be internal, all using the same host. Hello everyone, Is it possible to set static leases in DHCP and DNS (dnsmasq) to allow for two different fixed ip addresses to be assigned to the same MAC address? I have a linux based box (Debian derivative) that has eth0 and what I suppose is an alias interface named xx@eth0. Marketing: Understand the geographical distribution of multiple IP addresses. net 140. You'll need to contact your host and have them change the rDNS record. 2. $ hostname debian while mini is a virtual host for an apache site. I recently acquired another IP address IP2 for the same server, # The primary network interface (hostname: host0) auto eth0 iface eth0 inet dhcp # Secondary interface auto eth1 iface eth1 inet dhcp hostname host1 (for some long forgotten twisted reason we had our workstations living in two different IP networks running on the same cable for a while). And both domains can successfully send emails by using the same MX mail. Instead of "hostname-v6. z which is portforwarded to that box in a router. 1 - 192. I regularly ssh into a computer which is a dual-boot OS X / Linux computer. 2 gamma, 192. 48) and I would like to use /etc/hosts to associate multiple domains with that IP. 100/24 Jan 16, 2025 · If there are two hosts with the same name, but different IP address and different host key, this workaround also works: Comment out (or temporarily delete) then both lines for that host (the one based on IP address and the one based on host name), connect to the not-yet-known host, and then re-add the lines, that were commented out or deleted. By giving mulitple IPs to the same domain name the incoming requests are simply split among the servers that listen on those IP addresses. Let's say the IP is 192. mydevsite. Those are called "CNAME records". I'm not sure if it's the right way but it's working. (Environment: internal server 2019 dns server) Teamed IP once it's up and stable, but just after a reboot, one of the nics comes up faster than the For a while I have been formatting my hosts file like this. com, I am getting the reply from Public IP. Dec 11, 2013 · That is not required. 1 localhost 127. I don't want the entire script, just some suggestions. These 2 links will give you an idea how to use What you end up with is two names pointing to the same IP. 4 example. This can be useful when you want to run multiple websites with unique IP A single host can have multiple active IPs and this is what you are seeing. Apparenty most people do Question 1: Yes it is possible for multiple devices to have the same hostname on a network, you can simply change the name of any two computers on a network and they will share the same hostname. for example. If your service is served by One can always potentially "roll your own" by, e. freenode. 1 test 192. To randomly distribute traffic across multiple servers, set up multiple DNS A or AAAA records for the same hostname. You can point unlimited hostnames (or rather DNS names) to each interface, each ip-address. – user3076105 Is it possible to have a single host name with multiple IP addresses? The hostname will be used to access a box in LAN with 192. In this example, hostA has 2 IP addresses and 3 aliases. E. The two OS instance do not share the same host key, so they can be seen as two host sharing the same IP and DNS. the host which is connecting to the destination SMTP server), not for the sender address/domain (i. Please explain in CISCO way! Thanks & regards, Swaminathan. If I delete the DC-02 entry, it will eventually regenerate back. com I read recently that aliases are supposed to can two hosts share the same IP Address without a conflict. which is to let me associate the same hostname with multiple IP addresses. net Then add to the dnsmasq. So, I would like to know what does more than one IP address signify? Also, I would like to understand how did my system could end up with multiple IP addresses. In some situations it would be helpful to have a DNS record be one IP on VLAN 1 but have that same DNS record resolve to a different IP on VLAN 2. ServerAlias in Apache is not an option They are not the same: The hostname is a mapping to the IP address. f. If you need more fine-grained control over traffic distribution — including automatic failover, intelligent routing, and more — set up our add-on load balancing service. The reverse mapping from ip-address to DNS name is I'm trying to loop through all IP address within range (192. 1. May 11, 2017 · Otherwise, multiple MXes for the same domain wouldn't be possible. Both the gateway pointers at network nodes and the normal host pointers at full address nodes use the PTR RR to point back to the primary domain names of the corresponding hosts. The computer obtains the address 192. Think of it as a first level load Yes, it is possible for multiple hostnames to use the same ip address, the best practise is to use a CNAME record to point to the A record bar. Sigh. A many-to-one relationship. com - LAN IP private -This is the second entry. Internet tools host does not look at your local IPs, it looks up the hostname based on the rules specified in /etc/nsswitch. Some of the devices in my listing have two IPv4 addresses, some have one, one has three. just use the format We've just discovered (by accident) a benefit to sharing the same hostname between two computers on the system, to do with the shonky way some old software is set up. This might be done where a web service is rebuilt on a different machine for example. com and www. This is a non-domain environment, small business, with a single switch for a small lab and a single router for staff. b. You can have multiple IPs for Domain and IP bulk lookup tool allows to lookup domain, location, ISP and ASN for multiple hosts (IPs or domains) at once. 1) through the server's IP configuration settings within Windows, did the same with our When you assign a temporary IP address from that IP subnet, your computer becomes a member of that IP subnet. you have a service IP floating between two hosts, and each host has exclusively Also, some bots use keep-alives to keep the TCP connections open & make multiple HTTP requests over the same connection. So basically all it does is act as a local "DNS database" which can be used to easily translate a We've just discovered (by accident) a benefit to sharing the same hostname between two computers on the system, to do with the shonky way some old software is set up. Find answers to resolve multiple IP address to same host name with hosts file from the expert community at Experts Exchange. I. 105 chat. DNS is not a 1:1 relationship. 17. Jun 13, 2012 · you can have multiple A records for one device. all this means is that it can be referenced with more than one name. I have seen that I can have multiple adaptors in a dhcp-host connection, but not at the Create a file, say /etc/hosts. So: Yes, you can implement some load sharing using multiple DNS records for the same service. The same one you used in your original example where you managed to get both "hostname" and "hostname. So it seems that dnsmasq doesn't do what I hoped it would, which is to let me associate the same hostname with multiple IP addresses. The rDNS doesn't apply to the sending domain, rather the host name of the server. The PTR record for a reverse name (eg 7. - All switches have unique hostname / VLAN IP. g. Multiple Nginx Ingress controller in same namespace? 0. com shows this and www. 255) and print out the IP address that contains X hostname. Now, client A and client B have the same IP address registered in DNS. You could conceivably get dozens of different answers for the same query at any particular moment in time. – I have previously setup my mailcow server for my domain domain1. com. A far more efficient approach will be to use a dedicated machine as load balancer. Given that the DNS lookup is only done when a connection is made, they will continue to make requests to the old IP Thanks. 1 beta, 192. one web server will host many pages, but each page will have a unique dns record name all pointing to the same IP Mar 10, 2016 · So you can have any number of domains, dynamic or not, pointing to the same IP. In nsswitch. 60. Notice the same ip on two lines: e. com e. Over time the same hostname could map to a different IP address. it and eventlog. 10 There Alternatively you can also create multiple configuration files under /etc/dnsmasq. 11 by wifi The computer has a webapp and needs the Windows allows to assign multiple IP addresses (aliases) to a single physical network adapter. This is how my /etc/hosts looks like :-$ cat /etc/hosts 127. MailCow's hostname is mail. 168. You are not seeing two hosts with the same name*. 1 192. 254. But the answer to a previous question I posted Therefore for multiple IP addresses to be used for load-balancing purposes, the DNS server must change the order of the addresses supplied in the response, choosing the order randomly or in a sequential "round robin" fashion. Windows server hostname: XYZ ( 192. com has A record mail pointing to IP1. When I tried to ping ABC. conf the following line: HostName Specifies the real host name to log into. 1/24 dev eth0 When looking with ip addr show again, you see the second ip address assigned to the interface:. ianmacdonald3 (ianmacdonald3) December 29, 2016, 7 I am trying to get the local ip of the system using hostname -I. But note, that OpenSSH clients since version 8. com" in for both IP addresses, but had an extra "hostname-v6. XYZ. com has two IP addresses in the DNS. d/, one for each interface you want to serve dhcp. 1 and jump to the next ip in the list. myOtherDevSite. com - public ip -This is the first entry . example. gr, then the rDNS for the IP should point to wondergreece. Depending on what In name-based virtual hosting, also called shared IP hosting, the virtual hosts serve multiple hostnames on a single machine with a single IP address. On the other hand, different host names can point to the same physical host and IP address. It also supports lookup of MX or NS DNS records for multiple domains. However, it is showing three IP addresses, instead of one. Currently my hosts file looks like this: 81. combining with Dynamic DNS. ABC. 1-P1) in CentOS to give the same IP and hostname to two different MAC addresses (LAN and WLAN) on the same computer depending on which is connected. 1 Spice up. The only thing I can think of is that I may have made one before but dismantled it. h foo. This is the one returned by the hostname command (or the gethostname() call) and it's unique within a system (*). 10 by ethernet The computer obtains the address 192. If two computers belong to the same IP subnet, they I have a single IP (81. I am trying to use this code, but it only give me the last IP address which contains X hostname, I am managing multiple VMs with Vagrant. x. 211. Now the UI doesn't seem to accept CSV list of IP address or lets me add the same hostname with different IP address multiple times. i couldnt use the same sub-folder structure as the live site somehow. domainname Yes yes, I know, add multiple A records using the same hostname and different IPs, got it. 10) So anyone in the network when they ping XYZ will get reply from 192. This tool is commonly used for investigating IPs found in server logs. In this scenario, the DNS server can't scavenge client A's DNS record for another six days. This is possible because when a /etc/hosts syntax is one (host)-to-one (ip), so you'll have to do that in a different manner. 8. 9, and the names are hostname and hostname. It means you can have multiple certificates associated with the same IP address. z:8080 check server host_A a. 5 have ssh_config option UpdateHostKeys enabled by default, and with that enabled, the solution no longer works because the client automatically deletes all host keys that the connected host does not have (e. This option is useful for tunneling SSH connections or for multiple servers running on a single host. 48. 172 chat. 18. However, this is not the best way to implement load sharing especially in case you have all your hosts reside in the same location. 239. What you are seeing is a single host taking 1 or more IPs. a. 4 I have a file containing multiple hosts and IPs in the format above: alpha, 192. 3 I am trying to create a script that says something like: "Pinging hostname alpha" ping 192. it nerto I would like eventlog. in-addr. Cybersecurity: Investigate multiple suspicious IP addresses quickly. net, that has the same format as /etc/hosts file and list all IP addresses with name in this file: 130. 192. The best documentation you'll find on the topic is the virtual host documentation in the apache manual. If the hostname is wondergreece. Not that often, but still. Some dns servers have load balancing features to Mostly dupe How to add multiple IPv6 address for single host in /etc/hosts? as auto-suggested by Stack. That way you would only need to setup a single dynamic IP domain, and as many aliases as you want, which will always resolve to the dynamic IP. In fact, this is usually the default behaviour of DNS servers when they respond to hostnames with multiple A records. Use different ports to host multiple web applications on the same IP address. Since your router can only forward one port to one IP, it won't matter - if you forward RDP to one name and VNC to another, for example, BOTH names will respond to both requests, but only the PCs where the ports are forwarded to will answer. Hi there I’ve a specific use case : my hostname resolve on multiple IPs, each one for an HAProxy with the same configuration. Pihole uses the IP address to identify clients. Should have taken that as a large clue, I suppose. A SAN cert allows for multiple domain names to be protected with a single certificate. If you host multiple domains on a same mail server public IP, then you need it, that's what I did. conf you will typically have this entry: hosts: files dns hostname -I is synonymous to hostname --all-ip-addresses which means it will show all IP address of all interfaces (except loopback). I am trying to use this code, but it only give me the last IP address which contains X hostname, The PTR record is, in most (default) cases, only important for the MX server's hostname (i. In my domain controller DNS, there is always two entries with different hostnames (DC-02 and DC-04) with the exact same IP addresses. As shown in the Vagrantfile below. 218 <none> 80/TCP 12d It doesn't make sense to add duplicate rules for the same hostname (doesn't matter whether it points to same service or different service, but in case of different backend service, it is a bigger problem/ambiguity). I don’t have that much asking a couple of time for the same cert could do. Is it possible on a network to map a hostname to two differnt IP address's without using a DNS server? i have tried using the hosts file ie 192. From: field in the mail headers). . Hi This is a Canonical Question about Hosting multiple SSL websites on the same IP. They can come and go. Share. 6. Research: Gather data on multiple IP addresses for analysis. 1 172. Both interfaces are set to get their IP addresses Is it possible to have a single host name with multiple IP addresses? The hostname will be used to access a box in LAN with 192. In my computer, i have three configured interfaces (one is my physical (bridge) interface, one virtual interface for lxc and one virtual interface for docker), hence it shows: % hostname -I 10. Can a hostfile have a hostname pointed to multiple addresses? YES. Kubernetes ingress controller same path multiple ports. I was under the impression that each SSL Certificate required it's own unique IP Address/Port combination. 167. LSF uses the official host name, hostA, to identify that both IP addresses belong to the same host. Use host name to host multiple web applications on the same IP address. Aug 3, 2021 · Setting up a Kubernetes local cluster at home and I'd like to be able set more than one IP address for hostnames running on it. And BTW, this is not a software nor hardware question, this is a general computing question on how to properly use OS features. 1) through the server's IP configuration # kubectl -n test get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx ClusterIP 10. Why not having two hosts, athome and notathome and use the needed one each time? You can have Is it possible to have a single host name with multiple IP addresses? The hostname will be used to access a box in LAN with 192. Ideally I would put. 2 test and when you ping it always For the benefit of the asker: Put all the IPs into /etc/hosts under the same name. chat. Then use this name in ssh_config as the Hostname. Each venue switch is configured with the same IP, but traversing a VPN via different VLANs (L3 tagged) via a single trunk to a single central location where the Solarwinds Poller resides. arpa) is expected to identify the canonical name that is associated with that IP address. Without SNI you would need 1 IP address per certificate. If your devices have (and uses) multiple IP addresses (common with IPv6), it is normal for Pihole to list them separately as it does not know that this is the same device. c. com example1. com" as the resource name, what if you use just "hostname"? ABC. 1. d:8080 check However the IP addresses are not static which raises a second question, is the hostname only resolved when the configuration is loaded? I have a network cluster with multiple venues that host groups of switches. Why I am getting the reply from Public IP instead of LAN ip where the pc is part of that same subnet. The alias hostB specifies the first address, and the aliases hostC and host-C specify the second address. 42. Use this setup for simple, round-robin load balancing ↗. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff inet 192. 80. e. com but is it possible to resolve a hostname to another . The are two distinct things called hostnames. Please note that this tool has some limitations: That is the hostname that will be returned by the gethostname(2) and unamesystem calls. Is there any MS DNS option that would allow the following behavior: Yes, n. It's just important that the sending SMTP service Aug 12, 2022 · I have a single AD domain with 2 DCs running DNS that have multiple NICs attached to them for providing DNS to other VLANs. d/ to configure each interface: I know how to resolve a hostname to an IP address using my hosts file eg. The "internal" hostname is basically a string kept by the kernel. Now debian is my hostname. The Username and Port line avoids you having to give those options on the command line, too, The network overview page of the admin console appears to list the devices connected to the network being monitored by Pihole. That is not required. \h in Bash's PS1 expands to the The rDNS for an IP is set on the IP AuthNS, which is almost always controlled by your network provider. Both use the same Mac address. y and from outside with IP In order to get forward confirmed reverse DNS, an IP address must resolve to a hostname that resolves back that that IP address and only that IP address. y. 0. 66. com are both 80. example. Both statements are true: A host name can have multiple IP addresses in a load-sharing arrangement. Based on your description above, you want to use name-based virtual hosts. domain1. com shows this when the DNS entires for www. We have Unifi edge router which currently works as gateway and DHCP server. Thanks, Alex #3 - You want SNI turned on. Can a hostfile entry point to multiple addresses? NO. For instance if you have two wireless interfaces named wlan0 and wlan1, and you want to serve dhcp on them thanks to dnsmasq, you can create two files under /etc/dnsmasq. domain1. I have seen that I can have multiple adaptors in a dhcp-host connection, but not at the same time. backend test_http_back balance roundrobin server host_A u. I should only see DC-01 and DC-04. com" in there. It will be a mess when you map same hostname with multiple IPs. All the PCs will get IPs from the Unifi Edge Router. gr Some of my software deals with multiple IP addresses, and will attempt connections on the addresses in turn until either it runs out of options, or succeeds in connecting. First thing to keep in mind here is the true function of the hosts(5) file: "The hosts file contains information regarding the known hosts on the network. 48 nerto. ever set up any kind of Domain, Homegroup or Workgroup through Windows, I just set the server up with a static local IP Address (x. Use something intelligent like F5 etc. But you can also create aliases for a domain. Network Management: Analyze multiple IP addresses in your network. php file had <a>s to the individual indexes, and files were sitting in sub-folders. I should add that you can use a SAN certificate pre-IIS8 to have multiple SSL domains with same IP+port. 100? (which contains the domain/hostname) in . The limit is 100 IPs/domains per request. Just in case I tried the dumb way, each proxy grabbing all the certificates. Otherwise, multiple MXes for the same domain wouldn't be possible. in to also be resolved to 81. There are two types of virtual hosts: name-based and IP-based. Is there any MS DNS option that would allow the following behavior: Setting up a Kubernetes local cluster at home and I'd like to be able set more than one IP address for hostnames running on it. 174. It failed, the ACME challenge : one proxy I have a single AD domain with 2 DCs running DNS that have multiple NICs attached to them for providing DNS to other VLANs. A system only has one hostname/nodename, but it can have many interfaces. I can have name and namew for WiFi connections where there are I am trying to get the local ip of the system using hostname -I. In Jim's example, Steve might change his phone number but he would still be Steve. 1 mini Now as can be seen both mini and debian share the same IP Address. While you can have multiple PTR records for the same IP its not recommended unless absolutely needed. Name-based allows you to use a single IP address, while IP-based requires a different IP for each site. The trick is to stop using DNS for load balancing and failover. ssh then will try all of the given IPs and take the first IP it is able to connect to. In Apache, the top level (sites menu) index. The VMs can communicate with each other via the IP address, but I would like to know how to allow VMs to communicate using their assigned hostname. jvtbb kioo rmghe ckzh zotm dqx ofn nvih opvo cyxqx