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Date:      Mon, 6 Feb 1995 18:21:14 -0800
From:      Stephen Melvin <>
Subject:   Source IP address trashed on some packets
Message-ID:  <>

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Hello, I posted this question about a month ago and I'm still at
a loss to determine the problem.  I'd be grateful if anyone could
at least point me in the right direction.  How should I go about
tracking it down?  Thanks.

Since I upgraded from 1.1 to, I'm having trouble with
certain outgoing packets, specifically those from ping and traceroute.
Other services seem to work fine.  I ran tcpdump and determined
that the problem is that the outgoing IP address is garbage.  This
may have something to do with the fact with an ioctl error message
I get.  Also note that in this particular setup I periodically
invoke and then kill pppd (this since there is no demand dial and
I'm anxious to try out iij-ppp by the way).  Here is a sample log
when I invoke pppd:

Feb  7 02:45:02 seine pppd[4348]: pppd 2.1.2 started by root, uid 0
Feb  7 02:45:25 seine pppd[4350]: Connect: ppp0 <--> /dev/tty02
Feb  7 02:45:28 seine pppd[4350]: local  IP address
Feb  7 02:45:28 seine pppd[4350]: remote IP address
Feb  7 02:45:28 seine pppd[4350]: ioctl(PPPIOCSFLAGS): Inappropriate ioctl for device

Here are sample tcpdumps from a ping and a traceroute command showing
the nonsensical source IP address.

09:26:38.520605 > icmp: echo request
09:26:39.533073 > icmp: echo request
09:26:40.543428 > icmp: echo request
09:21:50.003290 > udp 12 [ttl 1]
09:21:55.013135 > udp 12 [ttl 1]
09:22:00.022998 > udp 12 [ttl 1]
09:22:05.033429 > udp 12
09:22:10.043181 > udp 12
09:22:15.052946 > udp 12

Thanks in advance for any suggestions.

Steve Melvin

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