Date: Wed, 24 Oct 2012 14:31:29 +0200 From: Harald Schmalzbauer <h.schmalzbauer@omnilan.de> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: every 2nd echo-request malformed when ping -s >4067 Message-ID: <5087DFA1.7090001@omnilan.de>
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Hello,
while checking new mtu9k-setup, I discovered that ping has some odd
behaviour.
If I use payloadsize > 4067, every 2nd icmp-echo-request seems to be
malformed:
ping -s 4068 -D 10.5.49.65
1st: 12:21:09.048447 IP 10.5.49.126 > 10.5.49.65: ICMP echo request, id
46597, seq 0, length 4076
0x0000: 4500 1000 0f2d 4000 4001 a507 0a05 317e
2nd: 12:21:10.052891 IP 10.5.49.126 > 10.5.49.65: icmp
0x0000: 4500 1000 0f2d 0040 4001 e4c7 0a05 317e
3rd: 12:21:11.062900 IP 10.5.49.126 > 10.5.49.65: ICMP echo request, id
46597, seq 2, length 4076
0x0000: 4500 1000 0f2d 4000 4001 a507 0a05 317e
4th: 12:21:12.072915 IP 10.5.49.126 > 10.5.49.65: icmp
0x0000: 4500 1000 0f2d 0040 4001 e4c7 0a05 317e
5th: 12:21:13.082900 IP 10.5.49.126 > 10.5.49.65: ICMP echo request, id
46597, seq 4, length 4076
0x0000: 4500 1000 0f2d 4000 4001 a507 0a05 317e
When payload is 4076, outgoing _every_ outgoing request begins with
4500 xxxx xxxx 4000 4001,
while above we see every second request starting with
4500 xxxx xxxx 0040 4001.
Does anybody know header composing off pat? Haven't seen these bits for
quiet some time...
Thanks,
-Harry
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