ip unnumbered command

[FaisalHenry]

i am in charge of configuring cisco 2600 router equipped with 16 port analog modem module,

i read that there are 2 ways to configure the module, one-by-one or by using group

if i use the group, i would have to enter the command
int group-async 1
ip unnumbered fastethernet 0/0
now, i think this command would set the ip address of the particular module to the ip address of the fa interface,

my question is, in my opinion this means that there could be only one connection at a time from the modem module, is this true?

 

[wybnormal]

I think you are asking two different questions. I would recommend a loopback connection rather then a ethernet port which could bounce and screw up the works. This is best practices from Cisco themselves. The second is the loopback provides the unumbered IP for the INTERFACE.. not for the modems. The modems themselves can be part of a pool which which would assign an IP from a range you set.

If you post the config minus IPs and passwords, we can take a look and offer suggestions.

MikeS Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[FaisalHenry]

sure mike, this is the code i use to configure modem group
i think you can tell that i am using dhcp, if i use an ip pool i just add the line
ip local pool default 172.29.201.2 172.29.201.18, right?
interface Group-Async 1
group-range 0 15
encapsulation ppp
async mode interactive
ppp authentication chap pap

ip unnumbered FastEthernet 0/0
ip tcp header-compression passive
peer default ip address dhcp


this is to configure the FastEthernet, the fa connect to a 3200 switch, btw is the cable should be cross or straight?

int fa0/0
cdp enable
ip address 172.29.201.1 255.255.255.0
no shut

ok, i think that should cover it, would glad to receive help my man

 

[FaisalHenry]

oh one more thing,
i am a bit confused, i have added the command
Router(config-if)#no shutdown
to the Group-Async 1 (the modem group), but when i checked them by using show interface async 33 (modem port 0), the status is
async 33 is down, line protocol is down ,

should i bring them up one by one?