Choosing outgoing IP about em-proxy HOT 4 CLOSED

Hmm, that's a great question. Assuming your box has multiple IP's assigned to it... I'm not sure if EventMachine has any API's for picking a specific interface to initiate an outgoing connection.

@tmm1: any thought on this?

Equivalent for curl: http://stackoverflow.com/questions/2425651/select-outgoing-ip-for-curl-request

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Use EM.bind_connect

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Ah, figures.. Never used that API before. Thanks!

@barbolo, so the answer is: yes it is possible, but it would require some patching to support this use case :-)

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Thanks @tmm1 and @igrigorik!

I tryed patching the em-proxy gem and believe I got it working. One new problem is that EM.bind_connect (as well as EM.connect) seems not to work correctly with IPv6. The IP addresses attached to my machine are all IPv6.

I replaced the following line of lib/em-proxy/connection.rb:

srv = EventMachine::connect(opts[:host], opts[:port], EventMachine::ProxyServer::Backend, @debug) do |c|

with:

ipv6 = Socket.ip_address_list.sample # choose a random ipv6 attached to the machine
srv = EventMachine::bind_connect(ipv6, nil, opts[:host], opts[:port], EventMachine::ProxyServer::Backend, @debug) do |c|

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