Reverse Proxy with 500k connections

Maxim Konovalov maxim at
Wed Mar 8 11:20:58 UTC 2017

On 3/7/17 10:50 PM, larsg wrote:
> Hi,
> we are operating native nginx 1.8.1 on RHEL as a reverse proxy.
> The nginx routes requests to a backend server that can be reached from the
> proxy via a single internal IP address.
> We have to support a large number of concurrent websocket connections - say
> 100k to 500k.
> As we don't want to increase the number of proxy instances (with different
> IPs) and we cannot use the "proxy_bind transarent" option (was introduced in
> a later nginx release, upgrade is not possible) we wanted to configure the
> nginx to use different source IPs then routing to the backend. Thus, we want
> nginx to select an available source ip + source port when a connection is
> established with the backend.
> For that we assigned ten internal IPs to the proxy server and used the
> proxy_bind directive bound to
> But this approach seems not to work. The nginx instance seems always use the
> first IP as source IP.
> Using multiple proxy_bind's is not possible.
> So my question is: How can I configure nginx to select from a pool of source
> IPs? Or generally: to overcome the 64k problem?
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Maxim Konovalov

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