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Forum Discussion

Stuart_Myers_88's avatar
Stuart_Myers_88
Icon for Nimbostratus rankNimbostratus
Sep 14, 2012

Modifying SMTP traffic

We are having an issue with our spam filters sending email from their internal hostname "spamfilter.domain.com", as opposed to our externaly availible "mail.domain.com".       All SMTP tr...
application delivery
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Mohamed_Lrhazi's avatar
Mohamed_Lrhazi
Icon for Altocumulus rankAltocumulus
Sep 20, 2012
tcpdump is for capturing traffic, you could have it store the capture to a mycaptrue,pcap, download the file and open it with wireshark.

 

 

options I use most:

 

 

-s0: means capture the full packets, by default it truncates them.

 

-w /var/tmp/outpufile: dont print packets out, store them in binary format in given file

 

-i vlan_name: the VLAN name to listen on, find list of names with "ifconfig -a" or use "any" for all VLANs.

 

 

man tcpdump for more.