Firewall & Routers Penetration testing

Dear All,

Can anyone please share your experience on Firewall and Routers
Penetration testing.
Please list the tools and techniques which should be tried.

Couple of things which i have in my mind for testing
1. HTTP Tunnelling
2. Covert Channel Testing
3. Port Redirection Testing
Please suggest to perform these as well.

Is there any way we can determine from outside what is the internal ip
range or subnet...or we can read the firewall running config ?

Thanks in advance.

Regards,
Anwar

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