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Need some help

post #1 of 14
Thread Starter 
just doing a lab for a lecture i missed at school and i can't figure out for the life of me on how to finish it i need to figure out the static route for the router here's a picture of all the information, along with the initial question:

post #2 of 14
ip route 0.0.0.0 0.0.0.0 192.168.111.138

which translates into any IP any subnet (0.0.0.0 0.0.0.0) go to R1-ISP s0/0/0 192.168.111.138
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by bratas View Post
ip route 0.0.0.0 0.0.0.0 192.168.111.138

which translates into any IP any subnet (0.0.0.0 0.0.0.0) go to R1-ISP s0/0/0 192.168.111.138
ah thank you i will give it a try once i get home.
post #4 of 14
No, that's from the Cisco Networking Academy. They teach level one quad-zero default static routing over shared access networks by adding both the exiting interface and next hop IP address to prevent recursive lookups.
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post #5 of 14
well the other way would be
ip route 0.0.0.0 0.0.0.0 s0/0/0


which is essentially exactly what i put in at first

both being a static
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post #6 of 14
I assumed the static route was being applied on an interface connected to a multi-access network. Sorry.

Two things about static route best practices..
  • When using point-to-point links utilizing encapsulation protocols with no working concept of layer two addressing like hdlc or ppp there is no need to use the IP address of the next hop router. You can just use the exiting interface.
  • When using a static route connected to a multi-access network like ethernet that uses mac-addressess you should put the exiting interface & next hop IP address so the router knows which IP address to ARP for it's data link address if the routers arp table is empty. By using only the next hop IP address on a static link on multi-access networks the router needs to preform an additional lookup to see which interface is associated with the network of the next hop IP address.

That's what I meant by recursive lookup.
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post #7 of 14
Quote:
Originally Posted by scottsee View Post
I assumed the static route was being applied on an interface connected to a multi-access network. Sorry.

Two things about static route best practices..
  • When using point-to-point links utilizing encapsulation protocols with no working concept of layer two addressing like hdlc or ppp there is no need to use the IP address of the next hop router. You can just use the exiting interface.
  • When using a static route connected to a multi-access network like ethernet that uses mac-addressess you should put the exiting interface & next hop IP address so the router knows which IP address to ARP for it's data link address if the routers arp table is empty. By using only the next hop IP address on a static link on multi-access networks the router needs to preform an additional lookup to see which interface is associated with the network of the next hop IP address.

That's what I meant by recursive lookup.

yeap, totally agree for best practice loopback is preferred. However I was reading what the question was asking.

"The static route on the R2-Central should be a default static route which points via R1-ISP's serial interface IP address."
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post #8 of 14
Why are you talking about loopbacks?
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post #9 of 14
it was in response to your statement about multi-access networks.
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post #10 of 14
I still don't get it.. Loopbacks and multi-access networks are two different things.
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