| Author |
Going crazy gonna break somthing......
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| ChrisDfer 2002-11-16, 11:12 pm |
| I am using routersim 3.2 however I cant seem to get it to get my network working on it. I have it setup like this I have 3 routers each and two hosts. Router A connects to Router B via a serial connection, Router B also connects to Router C and then host A connects to router A over ethernet and Host B to router C. I assign IP addresses as follows
Router A:
Serial 0(DCE)- 192.168.1.1 /24
Ethernet 0- 192.168.10.1 /24
Router B:
Serial 0(DTE)- 192.168.1.2 /24
Serial 1(DCE)- 192.168.2.1 /24
Router c:
Serial 0(DTE)- 192.168.2.2 /24
Ethernet 0-192.168.11.1 /24
I set the clock rate on the DCE devices
Use Router RIP to enable RIP on all routers
enter Network 192.168.10.0 in router A
enter Network 192.168.11.0 in router C
I check the routing tables and all looks good all the routes show up ok. But when I try to ping HOST B from HOST A nothing gets through.
I use the NET DETECTIVE and it says "The desired address falls outside of the protocol networks setup for one or more devices" What am I doing wrong? What am I missing here?
Thanks Chris | |
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| Yeah, I would say you IP addresses are wrong. You are using a C class address yet have different network addresses. If you are using a mask of 255.255.255.0 then the network section of the address needs to be constant. Create subnets by borrowing some bits. eg. Borrow 4 bits - for subnets - gives you max. 14 subnets & 14 hosts.
#1 194.100.40.16 Hosts x.x.x.17 - 30
#2 194.100.40.32 Hosts x.x.x.33 - 46
#3 194.100.40.48 Hosts x.x.x.49 - 62 and so on. You must use the same network address for your routing protocol: In this case
Router(config)#router rip
Router(config-router)# network 194.100.40.0
Given the information you have presented, I can only suggest this is the problem. Best of luck with it...hope this helps. I'm sure others will add bits I've left out. | |
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| I forgot to mention your new mask would now be 255.255.255.240 Don't forget the 'wire' been each router is a subnet. | |
| ChrisDfer 2002-11-17, 6:23 am |
| Well I got it to work but I didnt mess with the addresses and subnet masks. I guess I didnt have the routers advertising all there connected networks. However I am failing to see the logic as to why I need to do this. If router A sends out its update telling all the routers that network 192.168.10.0 is connected to it. Then wont router B send any packets directed towards network 192.168.10.0 to router A? And then since router C also has network 192.168.10.0 via router B in its routing table wont it then forward that packet to router B and then Router B would then forwar it to Router A? I dont understand why this didnt work until I added every single network connected to each router to the RIP updates.
I hope this makes sense, its really late here and I might not be thinking right lol heh. | |
| Yankee 2002-11-18, 4:16 am |
| My guess is that it is the serial networks you left out and you did your ping tests from the router and not a host on your ethernet. This would make your source address the serial network and while the ICMP packets knew how to get to the other ethernet they did not know how to return to your source serial address so they were dropped.
Just a guess without seeing your routing tables.
Yankee
PS your addressing is fine. | |
| mitchej@bp.com 2002-11-18, 5:04 am |
| Chris
The only thing you were missing were the network statements for the serial connections for router rip:
network 192.168.1.0
network 192.168.2.0
Nothing to do with your IP addresses or masks
Jeff | |
| ChrisDfer 2002-11-18, 1:01 pm |
| Well yeah I finally figured that part out. What got me stumped was the fact that the routes were still showing up in the routing tables. So I thought I was doing everything correctly.(stupid routersim, cant wait till I get some real ones) Thanks for your input. |
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