Re: GNUGK, even when bound to IP address does not source it's packets always from correct IP

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Hi Andrew,

thank you very much for you posting, it is very enlightening indeed.

Am Donnerstag, den 11.11.2010, 09:53 -0500 schrieb Andrew Herdman:

> So further to my own investigation, I found that if you leave Home= as 
> blank, the Bind=x.x.x.x is processed which achieved my goals.

This was, what I found out myself the hard way, too.

> I do find it odd that the Bind= line has a pre-requirement of Home= 
> being blank.  The documentation specifies that the default for Home= is 
> 0.0.0.0 which is not entirely true.

A specifying a home of "0.0.0.0" does not work, by the way:
| Fatal: Cannot find any interface to run GnuGk!

> If Home= is left blank, the GNUGK 
> interrogates the system for interfaces, and connects to each of these 
> interfaces directly.

... and determines the IP addresses to use.

> This is not the same as 0.0.0.0, in which the 
> GNUGK connects only to 0.0.0.0 which allows for the underlying Linux 
> system to add and delete IP interfaces and allow the application to 
> connect to the new IP that was added to the system without a restart.

Which happens on my system a lot, but at least after the startup of
Quagga's zebra daemon, which is why I have to restart the GnuGk twice
after startup. But at least now I know the reason :)

So how to proceed?

Maybe Jan can tell us about the original intent of those two parameters
and then it could be clarified in the Doku. Maybe it has something to do
with the fact, that the IP address data has to be used for L7, too?
What I see from your tcpdump two postings above is the following: 

>>> IP 10.10.1.88.1719 > 10.10.10.38.1719: UDP, length 99
>>> IP 10.10.10.38.1719 > 10.10.1.88.1719: UDP, length 31

ARQ, ACF

>>> IP 10.10.1.88.5564 > 10.10.10.36.1720: S 

So it seems, the Gk still sent an destCallSignalAddress of 10.10.10.36


Regards
David


-- 
David Dahlberg <david.dahlberg@xxxxxxxxxxxxxxxxxx>    

Fraunhofer FKIE, Dept. Communication Systems (KOM) | Tel: +49-228-9435-845
Neuenahrer Str. 20, 53343 Wachtberg, Germany       | Fax: +49-228-856277


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