06-04-2008 02:32 PM - edited 03-03-2019 10:14 PM
This is the diagram: http://img118.imageshack.us/img118/7521/networkim4.jpg
I have used VLSM to assign network addresses to the HQ, Factory and Marketing & Sales routers. I used the "Company IP addressing" scheme as shown in the diagram.
But I don't know what to do for the ISP_Interface router. Is 202.12.45.32/29 a NETWORK address for the router, whereby I would use 202.12.45.33/29 as first available IP address, or do I assign 202.12.45.32/29 to the serial interface of that router?
My task is simply to use that limited information to IP address this network and I'm confused with what to do with the ISP Interface router and IP address given.
Solved! Go to Solution.
06-04-2008 03:04 PM
202.12.45.32 255.255.255.248 is the network address. The available addresses are
202.12.45.33 -> 38 with 202.12.45.39 being the broadcast address.
So you need to know what 202.12.45.3x address your ISP has used for the interface on their router and then you can choose one of the other available addresses for your router.
Jon
06-04-2008 03:04 PM
202.12.45.32 255.255.255.248 is the network address. The available addresses are
202.12.45.33 -> 38 with 202.12.45.39 being the broadcast address.
So you need to know what 202.12.45.3x address your ISP has used for the interface on their router and then you can choose one of the other available addresses for your router.
Jon
06-05-2008 06:35 AM
Thank you both for your help. It has answered my question!
While configuring the network and proceeding with my learning curve, I have to configure a default route on the HQ router that forwards the default trafic to the ISP router. I then have to redistribute this default route to the other routers.
Am I right in saying I must apply a default route which will be: 0.0.0.0 0.0.0.0 [ip address of serial interface on ISP router]?
If that is correct, how do I then redistribute the default route to the other routers?
06-05-2008 06:36 AM
Thank you both for your help. It has answered my question!
While configuring the network and proceeding with my learning curve, I have to configure a default route on the HQ router that forwards the default trafic to the ISP router. I then have to redistribute this default route to the other routers.
Am I right in saying I must apply a default route which will be: 0.0.0.0 0.0.0.0 [ip address of serial interface on ISP router goes here]?
If that is correct, how do I then redistribute the default route to the other routers?
06-05-2008 08:47 AM
Yes you are correct. The default route would point to the IP address of the ISP serial interface.
How you redistribute this to other routers depends on which routing protocol you are using. Which one are you using ?
Jon
06-05-2008 01:24 PM
Thank you for your reply. The protocol is EIGRP.
06-05-2008 01:42 PM
Assuming 202.12.45.33 is the ISP serial interface. On your HQ router
2600(config)# ip route 0.0.0.0 0.0.0.0 202.12.45.33
Then under your router eigrp configuration
router eigrp
redistribute static
This tells EIGRP to advertise the static route to it's peers.
Jon
06-04-2008 03:05 PM
202.12.35.32/29 means
you can use IP addresses in the range of .33 - 38
202.12.35.32 - network, cant use it
202.12.35.33 - available
202.12.35.34 - available
202.12.35.35 - available
202.12.35.36 - available
202.12.35.37 - available
202.12.35.38 - available
202.12.35.39 - Broadcast, cant use it
So set ISP_interface with 202.12.45.33/29 and HQ with 202.12.45.34/29
ISPs usually hand out /30's and /29's for connecting with customers, you can use the remaining 4 IPs in that /29 segment for management devices, etc.
06-05-2008 09:03 AM
202.12.35.32/29
Essentially is
2^5 = 30 Subnets
2^3 = 6 Hosts per Subnet
So the 202.12.35.32 would fall under
32--> Network
33
34
35
36
37
38
39 --> Broadcast
HTH
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