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salam
this is not a linux question but since a linux host can act as a
router as well as a gateway, kindly ponder and give me the right
concept.
1. once i talked to an ISP in lahore http://www.wol.net.pk and asked
why i cant read mails off my pop3 account at their server if i am not
connected to their service. they answered that they had blocked the
port 110 access at their main router.
2. browsing a book on networking, i came across an explanation. a
network router is different from a network bridge. a bridge does not
have the network layer or the IP layer in it and the router has this
layer inside it. so it can compute/decide on the basis of IP
datagrams.
3. my networking teacher taught the other day in the class that
"...the router would never look inside the payload of the IP
datagram, would just play with the header of the IP datagram and do
this and that..."
I am confused now. Cisco certified people kindly explain to me. if
the router wont look what payload the respective IP datagram is
carrying, how can the statement no. 1 be true? my poor knowledge says
the port numbers are only visible inside the TCP segment.
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