[ee122] hw #2 problem #6

Lisa Fowler fowler at eecs.berkeley.edu
Wed Sep 26 23:40:32 PDT 2007


Slide 16 in the Wireshark ppt (check my section page for a link) has
info on the special tcpdump that you should be using:

/share/b/ee122/tcpdump

This worked for me.  As you can see, running just "tcpdump" isn't the
same as the special one that we need....

c199 [1] ~ > which tcpdump
/share/b/ee122/sun4u/bin/tcpdump

c199 [2] ~ > /share/b/ee122/tcpdump
tcpdump.sun4u: verbose output suppressed, use -v or -vv for full protocol decode
listening on qfe0, link-type EN10MB (Ethernet), capture size 68 bytes
23:38:53.014188 IP c199.1022 > ping.EECS.Berkeley.EDU.nfsd: P
4264839987:4264840111(124) ack 431900584 win 49640
23:38:53.014595 IP ping.EECS.Berkeley.EDU.nfsd > cory.EECS.
......

Let me know if you have any problems with this...

-Lisa

On 9/26/07, Josh Hunt <joshua.hunt at berkeley.edu> wrote:
> I'm trying to use tcpdump on the inst machines for problem #6, but I can't
> seem to get access to the ethernet devices.  I thought it was supposed to
> have the setuid bit set but it is not.  Here's what I get when I try to run
> tcpdump:
>
> c199 [32] ~ > tcpdump -i qfe0
> tcpdump: /dev/qfe: Permission denied
>
> c199 [33] ~ > tcpdump
> tcpdump: no suitable device found
>
> c199 [34] ~ > tcpdump -w tracefile host mx2.eecs.berkeley.edu and port 25
> tcpdump: no suitable device found
>
> c199 [39] /share/b/ee122/sun4u/pkg/tcpdump-3.9.7/sbin > ls
> -al
> total 1400
> drwxr-xr-x   2 root     root        4096 Sep 10 11:15 ./
> drwxr-xr-x   4 root     root        4096 Sep 10 11:14 ../
> -rwxr-xr-x   1 root     root      703960 Sep 10 11:15 tcpdump*
>
> Please let me know what I'm doing wrong.  Also, I tried to run wireshark and
> was getting similar errors about access to the device.
>
> thx
> Josh
>
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