Annoying Mcast Packets
Hi to all,
I have recently changed dialup ISP, and since then tcpdump is reporting
strange packets going to a variety of 224.0.0.0/4 addresses from
apparently the dialup node I'm connect to. Here are a two examples:
tcpdump: listening on ppp0
00:48:43.928630 195.130.232.243 > 224.0.0.1: igmp query v2 [tos 0xc0]
[ttl 1]
00:48:44.958630 195.130.232.243 > 224.0.0.13: pim v2 Hello (Hold-time
1m45s) (OLD-DR-Priority: 1) (State Refresh Capable ?0x1000000?) [tos
0xc0] [ttl 1]
2 packets received by filter
0 packets dropped by kernel
I have tried to DROP such packets by telling the kernel using iptables:
Here is the listing:
Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP all -- Fe0-0-0.NAS-FI-1.net.tiscali.it BASE-ADDRESS.MCAST.NET/4
but of course this didn't work.
You must be wondering why I want to do this. The answer is that my modem
is set to close the dialup connection in absence of traffic on the
ppp0 interface, and these broadcasts are preventing it from doing so. I
am also aware that there is a way to tell pppd to ignore this, but that
seems not to work either. I have googled on the matter slightly, but no
ideas seem to pop into my mind.
Any advice or comments are very welcomed.
Thanks,
David.
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