I think my earlier question was not clear to some. So
let me refine it.
I mean to say without any s/w support a filtering
technique at router level can not filter those
packets.
Is it right. If yes then why.
I have a book which reads like.
"A router alone cannot fully control a stream of IP
packets, as it can not monitor the state of the state
of incoming and out going packets, so a some protocols
like FTp which which use more than one data stream
present problems for a router based firewalls.
Things get worse when you use a connection less
protocol like UDP,
which forms the basis of DNS. In order to control UDP
streams in a firewall, you need to add some form of
state monitoring to a packet filter"
I think my question is some waht clear now.
Sudipto basu
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The most I can do for my friend is.
Simply to be his friend.
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