[olug] UPnP on a Linux box

[Rob Townley]

Broadcast was not always added by default.   Look at the /sbin/ip address
command examples carefully for a plus sign '+'.

Is there a layer 2 smart switch with IGMP involved.  Replace with a dumb
switch.

Since multicast responses can come from multiple IP addresses ( at least
ping 224.0.0.1 does that)  "RELATED,ESTABLISHED" would not be enough.
On Jan 3, 2015 9:49 AM, "Kevin" <sharpestmarble at gmail.com> wrote:

> Whoops, saw that I didn't reply all like I should have.
>
> My input chain on the filter table has that rule already; I think that it's
> only applicable to connections that originate on the local system. But my
> nat table is wide open. A couple of rules to make sure that you're using
> OpenDNS, the masquerade rule that I listed earlier, and everything else
> goes straight through.
>
> I'll check out miniupnp. See if it has anything worth checking
> On Jan 2, 2015 1:24 PM, "Eric W. Biederman" <ebiederm at xmission.com> wrote:
>
> > Kevin <sharpestmarble at gmail.com> writes:
> >
> > > Hello all,
> > >
> > > I am trying to get UPnP to work on my linux router. Normal people will
> > have
> > > a linksys or a dlink box acting as their router; I have a CentOS 6.4
> box.
> > > My clients behind the router are having problems(Android Device Manager
> > > can't locate them when connected to the wifi for which the CentOS box
> is
> > > the router, Google Hangouts will work only when I enter that Hangout);
> I
> > > suspect that it's because their UPnP commands don't work. If I connect
> > them
> > > to my 3G hotspot, everything works fine and dandy. So I'm trying to get
> > > UPnP to work, but no commands I've done would have set up UPnP, to my
> > > knowledge.
> > >
> > > I've done some searching and have found
> > > https://gitorious.org/igd2-for-linux/ this page as the most promising,
> > but
> > > the most recent update is from Feb 2013 and I'd have to work from
> source.
> > > While I can do so, I'd prefer something both more recent and with
> > > pre-compiled binaries.
> > >
> > > So does anyone know of pointers to get UPnP working?
> > >
> > > Here's what I've done in a nutshell to get the routing working:
> > > echo 1 > /proc/sys/net/ipv4/ip_forward
> > > iptables -t nat -I POSTROUTING -o eth3 -j MASQUERADE #eth3 is my WAN
> > interface.
> >
> > I think that is missing a rule iptables rule in for other direction.
> > Something like:
> >
> >   iptables -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j
> > ACCEPT
> >
> >
> > Openwrt and most of the linux based home routers use miniupnpd
> > http://miniupnp.free.fr/ That might be worth looking at.
> >
> > Eric
> >
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