Re: ircd can't connect to localhost

Snow Cat (snowcat@math.csufresno.edu)
Fri, 15 Mar 1996 09:15:39 -0800 (PST)


Colten Edwards once wrote:
>
> On Wed, 13 Mar 1996, Snow Cat wrote:
>
> > Colten Edwards once wrote:
> > >
> > >
> > > Just compiled .73 and anxiously rebooted to see if localhost port trouble
> > > had been solved. No. Damn. This problem has been here since .59 kernel
> > > and someone who knows networking should have a look. (no i am not that
> > > person). localhost irc server no-one on the local system can connect
> >
> > Can you strace ircd and verify that it really binds to INADDR_ANY, not
> > just to host's IP address? Other daemons seam to work fine.
> >
>
> time(NULL) = 826832477
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 7
> bind(7, {sin_family=AF_INET, sin_port=htons(0),
> sin_addr=inet_addr("192.0.2.1")}, 16) = 0
> fcntl(7, F_GETFL) = 0x2 (flags O_RDWR)
> fcntl(7, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> setsockopt(7, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> setsockopt(7, SOL_SOCKET, SO_RCVBUF, [8192], 4) = 0
> setsockopt(7, SOL_SOCKET, SO_SNDBUF, [8192], 4) = 0
>
> What's weird about this is that two servers on the same localhost can
> connect to one another. It's just the clients that cannot.
>

Probably servers connect to the host's IP address rather than INADDR_ANY as
well.

I heard that now, by default, Linux doesn't allow a process to bind to the
same port on several interfaces separately. Anyone knows how to overide this?
In the meanwhile, why not patch ircd to bind to INADDR_ANY - it will work
with every version of Linux?

-- 
     Snow ^oo^ Cat <snowcat@math.CSUFresno.EDU>
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