: How to properly set up SRV DNS record? I'm setting up DNS server for my home network. It contains plenty of machines but I have only one public IP so there's a lot of NAT, proxies etc.
I'm setting up DNS server for my home network. It contains plenty of machines but I have only one public IP so there's a lot of NAT, proxies etc. Many people find it difficult to memorize all services provided by it. So i was looking for some DNS record that would allow me to list all services available in the network. I found TXT but it seems to be a bit rough. More interesting option seems to be SRV record but I'm not really sure how it should be used.
If I'm providing lets say 5 tcp services - 3 www server, 1 ssh machine and 1 ftp server how SRV records should look like? Something like this?: ('im using bind9 server)
service.prot.host class RR prio weigh port target
_tcp IN SRV 0 0 80 @ ; primary site
_tcp IN SRV 0 0 8081 site1
_tcp IN SRV 0 0 8082 site2
_tcp IN SRV 0 0 22 sshbox
_tcp IN SRV 0 0 23 ftp
;
_http._tcp IN SRV 0 0 80 @
_http._tcp IN SRV 0 0 8081 site1
_http._tcp IN SRV 0 0 8082 site2
_ssh._tcp IN SRV 0 0 22 sshbox
_ftp._tcp IN SRV 0 0 23 ftp
;
_tcp.site1 IN SRV 0 0 8081 site1
_http._tcp.site1 IN SRV 0 0 8081 site1
_tcp.site2 IN SRV 0 0 8082 site2
_http._tcp.site2 IN SRV 0 0 8082 site2
_tcp.sshbox IN SRV 0 0 22 sshbox
_ssh._tcp.sshbox IN SRV 0 0 22 sshbox
_tcp.ftp IN SRV 0 0 23 ftp
_ftp._tcp IN SRV 0 0 23 ftp
It looks quite illegible... Is it really how it should be set up? I mean there's a ton of duplicates in fact... Are any of those redundant? There are only 5 services and when I'm providing like 20 or more at home it's going to be hell of configuration...
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SRV records are meant for services which are designed to check for the existence of service records such as connecting to an XMPP server or a SIP server. DNS should not be used to provide a list of services for end users on your network to browse as DNS is not designed for users to directly read.
The best option is to add the information you need for users to identify the services on your network to an intranet page on your local network or other such publications your users can see them with.
As an example if you where to try to create an SRV record of...
_ftp._tcp.example.com it wouldn't work as the FTP protocol isn't designed to work with SRV records whereas if you where to create one for _sip._tcp.example.com this would work as the SIP protocol is designed to work with SRV records so that when you try to connect to a SIP address at example.com it will automatically look for the _sip._tcp.example.com SRV record to identify the DNS record for the specific SIP server which may be some-sip-machine.example.com.
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