[ILUG] Broadcast packets keeping pppd alive

[Ken Guest]

Dermot Buckley wrote:

> Hi all,
> 
> I have a new problem here which someone might be able to help me with.  A
> Debian (2.2.19) system with an isdn dial-on-demand connection (pppd's
> 'demand' setting) which connects to indigo and acts as our internet gateway.
> All was working wonderfully for the last few months until I rebooted the
> system last Weds.  Since then the system dials up ok, but the connection
> doesn't go down anymore (the idle setting is 360secs).
> 
> I did a little checking and it appears that broadcast packets from the isp
> are keeping the connection alive.  The logs are full of these, one every
> 10secs:
> 
> May 14 15:03:00 setanta kernel: Packet log: input - ppp0 PROTO=89
> 194.125.144.69:65535 224.0.0.5:65535 L=64 S=0xC0 I=52990 F=0x0000 T=1 (#29)
> 
> I gather these are to do with routing table updates, so I killed routed and
> restarted the connection but we're still getting the broadcasts.
> 
> Does anyone have any idea what triggers these broadcasts?  I'm at a dead end
> here so all help appreciated.
> 

IIRC it's SMB and Netbios packets as sent out from Windows PCs so you 
may want to filter out against the appropriate ports.



--
   Beware the fury of a patient man
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