What kind of network interface do you have? Some (like QETH) do not have
a raw or promiscuous mode, and thus can't do much to capture things that
aren't addressed to them.

> Is there a trick to getting tcpdump to work on zLinux?  I
> can't make it do
> what I want.  Tcpdump on MP-RAS (NCR's *nix) is much better
> behaved. I am
> using RedHat 7.2 with kernel 2.4.21. I also tried installing
> the latest
> libpcap and tcpdump but no change.
>

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