04-15-2010 12:27 PM - edited 03-06-2019 10:38 AM
Hi,
I've just installed a frame-realy lab for the first time and started using it. It's really basic with one hub router (R1) and two spoke routers (R2 and R3). I've setup two subnets 192.168.100.0/30 and 192.168.100.4/30.
Although I can ping the spoke to the hubs respectively, the confusing part is when I run "show ip route", for both the spokes I get the following:
R2:
Gateway of last resort is not set
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1
R3:
Gateway of last resort is not set
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.4 is directly connected, Serial0/0.1
For the hub I get:
R1:
Gateway of last resort is not set
192.168.100.0/30 is subnetted, 2 subnets
C 192.168.100.4 is directly connected, Serial0/0.2
C 192.168.100.0 is directly connected, Serial0/0.1
My question is why do the spokes and the hub say the following:
192.168.100.0/30 is subnetted, 2 subnets
Shouldn't R2 show
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1
and R3 shoudl show:
192.168.100.4/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1
Can someone please explain this to me?
Many thanks
Dan
Solved! Go to Solution.
04-15-2010 12:45 PM
dan_track wrote:
Thanks Jon,
Silly me in my hurry I got things the wrong way round, what I meant to say was shouldn't
R3 be:
192.168.100.3/30 is subnetted, 1 subnets
C 192.168.100.4 is directly connected, Serial0/0.1Ending with .3 will cover the connected subnet. Ending with .0 will not cover that network.
and R2 should be:
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1Also in R1
192.168.100.0/30 is subnetted, 2 subnets
C 192.168.100.4 is directly connected, Serial0/0.2
C 192.168.100.0 is directly connected, Serial0/0.1where it states " 192.168.100.0/30 is subnetted, 2 subnets", how can that be subnetted into two? "192.168.100.0/30" only covers teh first subnet it can't cover teh subnet 192.168.100.3/30?
Obviously I must missing something
Thanks
Dan
Dan
192.168.100.0 255.255.255.252 =
subnet = 192.168.100.0
2 host addresses = 192.168.100.1 & 192.168.100.2
broadcast address = 192.168.100.3
so your next subnet is
192.168.100.4 255.255.255.252 =
subnet = 192.168.100.4
2 host addresses = 192.168.100.5 & 192.168.100.6
broadcast address = 192.168.100.7
All R1 is saying is that it is aware of 2 subnets of the 192.168.100.0 network using the 255.255.255.252 mask ie. 192.168.100.0/30 and 192.168.100.4/30.
Jon
04-15-2010 12:33 PM
Dan
R3:
Gateway of last resort is not set
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.4 is directly connected, Serial0/0.1
the above is correct because the subnet is 192.168.100.4 255.255.255.252
and R3 shoudl show:
192.168.100.4/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1
this would not be correct because the subnet is not 192.168.100.0 255.255.255.252 as that is assigned between R1 and R2.
Jon
04-15-2010 12:40 PM
Thanks Jon,
Silly me in my hurry I got things the wrong way round, what I meant to say was shouldn't
R3 be:
192.168.100.3/30 is subnetted, 1 subnets
C 192.168.100.4 is directly connected, Serial0/0.1
Ending with .3 will cover the connected subnet. Ending with .0 will not cover that network.
and R2 should be:
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1
Also in R1
192.168.100.0/30 is subnetted, 2 subnets
C 192.168.100.4 is directly connected, Serial0/0.2
C 192.168.100.0 is directly connected, Serial0/0.1
where it states " 192.168.100.0/30 is subnetted, 2 subnets", how can that be subnetted into two? "192.168.100.0/30" only covers teh first subnet it can't cover teh subnet 192.168.100.3/30?
Obviously I must missing something
Thanks
Dan
04-15-2010 12:45 PM
dan_track wrote:
Thanks Jon,
Silly me in my hurry I got things the wrong way round, what I meant to say was shouldn't
R3 be:
192.168.100.3/30 is subnetted, 1 subnets
C 192.168.100.4 is directly connected, Serial0/0.1Ending with .3 will cover the connected subnet. Ending with .0 will not cover that network.
and R2 should be:
192.168.100.0/30 is subnetted, 1 subnets
C 192.168.100.0 is directly connected, Serial0/0.1Also in R1
192.168.100.0/30 is subnetted, 2 subnets
C 192.168.100.4 is directly connected, Serial0/0.2
C 192.168.100.0 is directly connected, Serial0/0.1where it states " 192.168.100.0/30 is subnetted, 2 subnets", how can that be subnetted into two? "192.168.100.0/30" only covers teh first subnet it can't cover teh subnet 192.168.100.3/30?
Obviously I must missing something
Thanks
Dan
Dan
192.168.100.0 255.255.255.252 =
subnet = 192.168.100.0
2 host addresses = 192.168.100.1 & 192.168.100.2
broadcast address = 192.168.100.3
so your next subnet is
192.168.100.4 255.255.255.252 =
subnet = 192.168.100.4
2 host addresses = 192.168.100.5 & 192.168.100.6
broadcast address = 192.168.100.7
All R1 is saying is that it is aware of 2 subnets of the 192.168.100.0 network using the 255.255.255.252 mask ie. 192.168.100.0/30 and 192.168.100.4/30.
Jon
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