how router connect to far router not exsist in its routing table ?

Question

how router connect to far router not exsist in its routing table like when i type yahoo.com so my isp search its routing table but i think its so far and not exist in its table how this happen.

Answer 1

re-phrase your question.

Answer 2

Your local ISP router need not have an entry for Yahoo.com in its routing table. All it should have is an entry that when a destination IP address in not in the routing table, simply forward it thought the default port. Any packet destined to a network without a matching routing table entry is simply forwarded out via the default port. This happens for each hop until packet reaches a router that has the entry for the destination and then exit is then made through that particular interface. Ultimately the packet reaches the destination, Yahoo.com. Its like you ask some one which way is the museum and he, not knowing exactly, guides you to the next person who may be of help, until you meet the person who know the place and lead you to the destination.

Answer 3

Since it relies on dns to give it the address of the remote machine, it passes this to it's nearest connected router, which works out the routing for it. This saves your machine from storing every route it uses,otherwise it's memory would fill and it would become very slow.

Answer 4

It would help if you told us the make and model of your router. But as a general answer, you could configure a static route. I'd suggest employing a routing protocol and letting the router determine the paths dynamically though.