[squid-users] Native FTP relay: connection closes (?) after 'cannot assign requested address' error

[Amos Jeffries]

On 23/01/2017 2:49 a.m., Alexander wrote:
> As far as I remember, I have tried both options, REDIRECT and TPROXY, but
> TPROXY is the preferred one for us. I will try one more time on Monday.
> However, I suppose that something else prevents squid from working properly.
> Maybe on of sysctls, like net.ipv4.ip_nonlocal_bind, will do the trick.

Maybe.

I expect that REDIRECT will be the required way for FTP at present,
since TPROXY has requirements that there is a client socket state to
associate with the non-local binding. Essentially that sockets are
opened directionally in sequence client->proxy->server - whereas FTP
data connections are opened in the opposite sequencing order:
server->squid first, then squid->client.

Amos