Multiple IP alias to be used with Nginx

Payam Chychi pchychi at
Fri May 29 22:23:55 MSD 2009

2009/5/29 Jérôme Loyet <jerome at>:
> 2009/5/29 Payam Chychi <pchychi at>:
>> Hey guys,
>> had a question for anyone that is utilizing massive amount of ip alise
>> on *nix* to allow proper ip listening for nginx. I currently have
>> 1x/24 and 1x/23 network that i need nginx to listen for... I also run
>> independent config files for each unique ip address on the box which
>> listens for an active ip address/adapter on the server. Ive had to
>> turn to using ip alise for this function to work properly but its
>> really a crappy way of doing this (having over 700 ip alise is not
>> something an admin would want to have) so is there a way to force
>> nginx to listen to an ip addresses/request that are not active on the
>> box? I am utilizing a Load balancer in an DSR mode...
> do you mean that on your real server the VIP are not mounted ?
> I use a similar architecture with LVS and direct routing (should be
> the same as DSR). And on the real server each VIP is mounted on
> loopback and the system is told not to respond to ARP request for
> loopback interfaces coming on ethernet interface (play with
> net/ipv4/conf/*/arp_ignore and
> /proc/sys/net/ipv4/conf/*/arp_announce). This way, each real server
> has its own VIP and nginx (or other softwares) can listen on them.
> hope it helps


yep, same concept only on the actual adapter is where im doing this
and simply dropping outbound arp requests...

Payam Tarverdyan Chychi
Network Security Specialist / Network Engineer

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