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i want to allow a specific host to use my linux firewall as a default
gateway .
what iptables rule will allow my to allow this host only that and will
block him from using any other ports/proto ?
firewall 10.90.20.5/24
client 10.90.20.3/24
other client reside on 10.90.20.0/24 network they cannot be allowed to use
my linux firewall as a default gateway

Thank you
Yaniv Fine