entering /32 subnet mask on ppp wan interface

I don't have a suitable router at hand to verify your problem, but if I'm not entirely mistaken, you can definitely use:

interface Loopback0 ip address 1.2.3.4 255.255.255.255

interface Dialer0 ip unnumbered Loopback0

HTH, Patrick

Hi Patrick

That worked a treat, thanks.

regards si

/31 is the best you can do on the dialer interface itself

cat6#conf t Enter configuration commands, one per line. End with CNTL/Z. cat6(config)#int dialer 0 cat6(config-if)# ip address 111.222.111.222 255.255.255.255 Bad mask /32 for address 111.222.111.222 cat6(config-if)# ip address 111.222.111.222 255.255.255.254

This has changed from 12.3 something. Old software permitted /32 mask, new software didn't.

I found out the hard way.

Remote software upgrade resulted in lost connectivity. Needed site visit to fix.

Sounds like you might want

int dialer0 ip address negotiated

??

If, even if you know which IP it will get, it can still negotiate it in IPCP to get the same one each time.

~ Simon writes: ~ >Can I enter a /32 subnet mask on a ppp dialer0 interface. It is ~ >negotiated at the moment but I want it to be hard-coded. ~ ~ >When entering the command on the dialer0 inteface I get the error ~ >below: ~ ~ >router(config)#int dialer0 ~ >router(config-if)#ip address 111.222.111.222 255.255.255.255 ~ >Bad mask /32 for address 111.222.111.222 ~ >router(config-if)# ~ ~ >The router is an 837 with IOS v12.4.7 ~ ~ >Is it possible to have a subnet mask for a ppp wan interface of either ~ >0.0.0.0 or 255.255.255.255. It certainly negotiates it as I can see it ~ >in the routing table. ~ ~ ~ Sounds like you might want ~ ~ int dialer0 ~ ip address negotiated ~ ~ ?? ~ ~ If, even if you know which IP it will get, it can still negotiate it ~ in IPCP to get the same one each time.

Assuming that the OTHER guy knows which IP address you should have, and that you TRUST the other guy.