Hi,
Can someone tell me what tools I could use to examine outbound packet data
for the usernames and modify it if it matches a list of accounts we want
to block?
I suggest writing your own netfilter-module that does the packet
inspection, and if a packet matches you can simply return NF_DROP to
instruct the kernel to drop the packet. A good tutorial/book is
available here: http://jengelh.medozas.de/
Maybe you can do something similar with libpcap, but I am not sure if
you can drop packets.
-Kristian
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