dumb question

Can someone please tell me why when I go to configure an fastethernet interface on my router it tells me "Bad /27 for 10.0.0.32" ??? I have my serial interface setup as 10.0.0.2/30 with another serial PPP interface..Does it have something to do with that?

The commands Im using:

int f0
ip address 10.0.0.32 255.255.255.224

I had this before but I forgot what I was doing wrong $:\$

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Comments

Humper

I am so embarrassed, the .32 is the subnet ID..not a valid host..what a brain fart

pannupandit

well u er putting subnet id in place of ip address. moreover the subnet mask u er using is wrong. As u er telling that subnet mask u er using is /32 but in the command u er using 224. Use 252 instead of 224 and use Ip address instead of subnet id. U need to study hard abt ur subnetting concepts.

jocampo

ModemHumper wrote:

Can someone please tell me why when I go to configure an fastethernet interface on my router it tells me "Bad /27 for 10.0.0.32" ??? I have my serial interface setup as 10.0.0.2/30 with another serial PPP interface..Does it have something to do with that?

The commands Im using:

int f0
ip address 10.0.0.32 255.255.255.224

I had this before but I forgot what I was doing wrong $:\$

We all are studying hard for this and we all are still learning new things. So don't feel bad.

Here's a tip:

256-224= 32 This will be your block bit. You should use 32 to find each and all subnets ... and as you could see now, it can not be used as a valid IP address for any interface because its a subnet itself.

pizzafart

Modemhumper, jocampo's post makes me think about a post you placed elsewhere. You asked about what things would be good to memorize or to memorize well enough to **** onto paper at the beginning of the test.

It's probably a good idea to memorize the number of addresses associated with each mask value:

mask addresses
128 128
192 64
224 32
240 16
248 8
252 4

Of course, take into account the subnet & broadcast addresses when necessary. (I'm sure you know this already)

You could get even more hardcore and go a byte back, starting with 32768, 16384, 8192, etc...