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I have 2 servers with (of course :D) 2 IP's, for example:

123.456.789.101 & 101.987.654.321

Now I have a domain example.tld and want all requests go to 123.456.789.101, except the ones which hit port 12345. These should be sent to 101.987.654.321. How do I do that? I haven't found a solution which worked yet.

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closed as off-topic by joeqwerty, Iain, kasperd, mdpc, MadHatter May 25 '14 at 7:43

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DNS doesn't do that. –  Michael Hampton May 24 '14 at 18:22
You need to go and read up on how DNS works. –  Iain May 24 '14 at 18:25

2 Answers 2

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You could use a simple nat rule in iptables of server 123.456.789.101, instead: Think of enabling ip forwarding first.

sysctl net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING -p tcp --dport 12345 -j DNAT --to-destination 101.987.654.321:12345
iptables -t nat -A POSTROUTING -j MASQUERADE
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Are your 2 servers behind the same router/Internet connection, or in two separate locations?

If they are behind the same router/Internet connection, you could use PAT (Port Address Translation) or VIP (Virtual IP) on your firewall/router to direct different ports on your public IP address to different servers/ports inside your private network. If they're not behind the same connection, you will need to use different subdomains, like ftp.example.tld could be hosted in one place and www.example.tld could be somewhere completely different.

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