Hi dennis,
I think I can answer your question.
The size of the buffers for packets in the ring buffer is set as a module
option when inserting the module, as an example:
insmod ring.o bucket_len=1514
See the readme in the kernel directory of the ring tar.gz for info on other
module options.
User side options like tcpdump -s cannot make you sample more data than has
been made available kernel side.
Paolo Milani
From: "Dennis Henderson" <hendo@hendohome.com>
To: <snort-users@lists.sourceforge.net>
Date: Wed, 22 Jun 2005 22:16:09 -0500
Subject: [Snort-users] PF_RING question
Is there anyone out there using PF_RING for your snort setup?
I seem to have it compiled into the kernel and have a modified libpcap that
works.
The problem is that I think that PF_RING is only letting me see 68 bytes of
every packet.
I'm using env vars PCAP_FRAMES=max and PCAP_SNAPLEN=1514 but when I
actually sniff the traffic using tcpdump with a -s 1514, I don't see packets
bigger than 68 bytes.
Have any of you clueful persons out there seen this behavior?
Thanks
Dennis
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