Confused with this network diagram

Answered Question
Jun 4th, 2008

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.

Correct Answer by Jon Marshall about 8 years 8 months ago

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

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
Jon Marshall Wed, 06/04/2008 - 15:04

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

Ballistics Thu, 06/05/2008 - 06:35

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?

Ballistics Thu, 06/05/2008 - 06:36

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?

Jon Marshall Thu, 06/05/2008 - 08:47

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

Jon Marshall Thu, 06/05/2008 - 13:42

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

ralphcarter Wed, 06/04/2008 - 15:05

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.

sdoremus33 Thu, 06/05/2008 - 09:03

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

Actions

This Discussion