You said 'i am able to ping 172.21.5.136 but not 172.21.0.1'
from a client machine on the internal network.
and 'i can
connect fine to the internet from the gateway'.
So you can ping, say google.com from your gateway machine correctly?
yes.
But
you can't ping 172.21.0.1 from your gateway?
i can ping 172.21.0.1 fine from the gateway but not from a client.
Since you can get to the internet from your gateway, then its routing should
be fine,
everything is indeed fine from the gateway. i can browse www.google.com,
ping my ISPs gateway (172.21.0.1).the problem is the internal network.
and the next thing is to configure IP masqurading to allow your
internal network to connect via that machine.
so i have to setup iptables? any pointers...?
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