In the context of firewall discussions, I saw this quote from the
Firewalls & Internet Security book fly by:
Is IP forwarding really off; will ICMP redirects change it?
What about IP source routing? You can only be sure by examining
kernel source code and carefully experimenting.
I understand what IP Forwarding is - where packets for a network
which is (presumably) not on the current network is sent to a machine
who will act as a gateway to the other network. A simple example of
this might be a dual-homed Sun host, with machines on one network
configured to have a default route to the Sun, which straddles the
line between the protected network and the DMZ network.
Which RFC and other documents should I read to learn all about ICMP
and why a redirect might change the status of IP forwarding?
What is IP Source Routing? The only definition I can come up
with on my own would have been the same as the IP forwarding.
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