ICMP tunneling through firewalls

[David Porcello <DPorcello () vermontmutual com>]

Ptunnel & ICMPTX work fine when the client/server are within the same local subnet, but most firewalls permit only one 
ICMP echo reply per ICMP echo request. Not a problem for exchanging a few chars through netcat, but anything that can't 
fit within a single ICMP payload (such as shoveling /bin/bash or ssh tunneling) gets dropped.

Has anyone found a workaround for this? Are there any extremely lightweight shells that may work under these conditions?

Thanks,
Dave.

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