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Is it possible to create a local DNS alias? For example I would like that every request to:

123.com is locally routed to 456.com (like it would be for 123.com CNAME 456.com).

I know this is not possible with /etc/hosts, but are there other ways or external tools that do the trick?

Thanks

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2 Answers 2

It is possible with /etc/hosts if it is a host to host mapping. For example

    456.com IP = 1.2.3.4

In /etc/hosts, you put the following line

    1.2.3.4 123.com

It is very doable if you know all the hostname you want to map to.

Also check the following line in /etc/nsswitch.conf

    hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4

Yours may have look different, but make sure hosts: is follow immediately by files. That means name/ip lookup use /etc/hosts before dns.

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Actually the request should be forwarded to "456.com" (not to a specific IP address). Kind of: 123.com CNAME 456.com –  Mark Nov 8 '12 at 2:50
    
With the above, the effect is exactly the same. Ping, http, etc. request to 123.com will go to 456.com server. Unless 456.com is a dynamic IP. –  John Siu Nov 8 '12 at 2:55

Set up dnsmasq to give out 456.com as a CNAME for 123.com

Add cname=alias,target to the conf.

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This won't work for OP's purpose. The dnsmasq documentation for cname states Note that this _only_ works for targets which are names from DHCP or /etc/hosts. OP wants to alias one public domain to another. –  chrispix Aug 9 at 20:09

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