4.8 and NIS enabled client spawning listening UDP ports per
process
Dan Nelson
dnelson at allantgroup.com
Mon Jun 16 22:21:58 PDT 2003
In the last episode (Jun 16), Brian Towles said:
> On Mon, 2003-06-16 at 10:48, brian at towles.com wrote:
> > Im running a 4.8 Release box as a NIS client and for every process
> > that either logs in or changes running as user a Listening UDP port
> > is created.
> >
> > Im putting some sample output from ps sockstat and lsof to show
> > what I mean. The problem is these UDP ports are listening ports
> > bound to all interfaces.
> >
> > It appears to be releated to NIS because when i uncomment the
> > +::::(etc) from the passwd and group files it goes away for any
> > newly started processes. I dont even have to turn off ypbind.
> >
> > Ive tried to put ypbind in secure mode and well as non broadcast
> > mode and the same results happen.
> >
> > Any ideas as to what this is? More importantly, any idea of how to
> > get rid of it?
>
> This seems to happen in 4.8 Stable as well as Release..
> Any clues?
>
> Im leaning towards someting in PAM but dont quite know what.
This is how NIS client access works. The first NIS lookup creates a
UDP socket which is used for the lifetime of the process to talk to the
NIS server. They're not listening sockets.
--
Dan Nelson
dnelson at allantgroup.com
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