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tcpdump -i any does not work

 
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# 1  
Old 03-24-2010
tcpdump -i any does not work
Hi Everyone,
anyone face "tcpdump -i any" does not work? i mean if i use -i eth0, can capture eth0, or use -i eth1 also can. but then tcpdump -i any, seems cannot capture packets. Smilie

please advice, thanks
# 2  
Old 03-25-2010
According to the man page that means that either you're not on Linux >= 2.2, or you're trying to capture in promiscuous mode:
Quote:
-i Listen on interface. If unspecified, tcpdump searches the system interface list for the lowest numbered, configured up interface (excluding loopback). Ties are broken by choosing the earliest match.

On Linux systems with 2.2 or later kernels, an interface argument of "any" can be used to capture packets from all interfaces. Note that captures on the "any" device will not be done in promiscuous mode.
# 3  
Old 04-16-2010
tcpdump -i ethx does not give any output
I have got servers recently built with RHEL5.3 . One three of these servers tcpdump -i ethx gives a regular output but on other servers there is no output when I run this command.

I have checked the NIC details they are similar on all the servers.
 
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