This is a configuration scenario for a firewall and
router.
INTERNET ---ROUTER------FIREWALL----INTERNAL
NETWORK
now say we use 16 IP addresses allotted from the
ISP. one for the router and one for the ext interface
of the firewall.
so we have remaining is 12 usable IP addresses.
also say we use only one flat network for the 16
IP addresses.
my question is about the interaction between the
router and ext interface of the firewall.
say we have an internal host which has been
NATed to the valid IP addresses(one from the
range that we have).
here is the crux. once the packet from the Internt
reaches the router , how does it manage to go to
the internal host ? I mean since the IP address of
the router and the NATed Ip address in the packet
belong to the same network , the router would
do an ARP. and since there is no host by that
IP address , the connection would drop.
The solution is to add a static route entry for this
IP address. But what i intend do via this post
is ask my peers if they encountered this problem.
To be frank, this was the problem with a leading
brand of firewall. For others, i dealt with three other
brands, there was no problem.
so i was wondering as to how come ?
If any of you has any clue as to how are the
headers manipulated then please do let me know.
thanks and please email me a cc of your replies.
tally
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