Re: [GnomeMeeting-list] Firewall rules with the new H.323 support in netfilter, 2.6.17.x



Dear Folks,

On 27/06/06 13:41 +0200, Damien Sandras wrote:
Dear Folks,

Thanks for your great work!  It looks like ekiga has come along so far
since my first tentative experiments with the old gnomemeeting many
years ago.

I was exited about the h323 support in the 2.6.17 kernel, now
available in my shiny new standard FC5 kernel
$ uname -r
2.6.17-1.2139_FC5smp
with these modules:
$ find /lib/modules/2.6.17-1.2139_FC5smp -name '*h323*'
/lib/modules/2.6.17-1.2139_FC5smp/kernel/net/ipv4/netfilter/ip_conntrack_h323.ko/lib/modules/2.6.17-1.2139_FC5smp/kernel/net/ipv4/netfilter/ip_nat_h323.ko

so I fired up ekiga on my machine, and read the documentation on the
website.

The firewall rules recommended at
http://www.ekiga.org/index.php?rub=3&pos=0&faqpage=x161.html#AEN188
suggest simply opening up all outgoing traffic of every find to
everywhere, and allowing anything to come back that is related.  All
traffic of every kind is opened up to and from the internal network.

The mail messages at
http://mail.gnome.org/archives/gnomemeeting-list/2002-March/msg00078.html
and
http://mail.gnome.org/archives/gnomemeeting-list/2002-March/msg00063.html
say that, to communicate with *netmeeting* *clients*, I need to do
something terrible such as allowing, both inbound and outbound, *all*
udp ports 1024:65535.

That is scary (okay, I'm a wimp :-).  Does anyone have any
recommendations for communicating with netmeeting clients that do not
involve the netfilter equivalent of an open-raincoat full frontal flash?


I think that you do not have anything to "open" for Netmeeting, as they
are outbound connections to Netmeeting.

I don't think so.  At this end we are using Ekiga.  We need to be able
to initiate and receive calls from netmeeting clients (our relatives
in Hong Kong!).

You just need to open ports for Ekiga. However, with the netfilter
module, simply opening up 1720 should be enough.

To accept calls from netmeeting clients, I am sure that I need to open
some ports.  I don't understand the requirements of H.323 (and
netmeeting) enough so that I can communicate with them through Ekiga.
Okay, I'll try simply opening TCP port 1720 in both directions to set
up the call.  Hopefully, all the rest will be "related".  Maybe I need
to read the code for the ip_conntrack_h323 module.
--
Nick Urbanik   RHCE         http://nicku.org        nicku nicku org
GPG: 7FFA CDC7+5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24 ID: BB9D2C24

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