IP only over ISDN

[admin_2]

Once an ISDN line is up, I need to allow IP only traffic over it. How do I specify that all the other protocols must not flow over this link?

[#2]

You dialer list should be enough to do this i.e provided you

do not have ipx/appletalk or any other desktop configured on the isdn interface.

Else you can use access-list to deny the other protocol traffic e.g ipx, appletalk etc.

Also you'll make sure that the other protocol cannot bring up the dialer.

dialer-list 1 protocol ip permit

dialer-list 1 protocol ipx deny

dialer-list 1 protocol appletalk deny

dialer-list 1 protocol llc2 deny

dialer-list 1 protocol netbios deny

dialer-list 1 protocol xns deny

dialer-list 1 protocol decnet deny

dialer-list 1 protocol decnet_node deny

dialer-list 1 protocol decnet_router-l1 deny

dialer-list 1 protocol decnet_router-l2 deny

dialer-list 1 protocol vines deny

dialer-list 1 protocol hpr deny

dialer-list 1 protocol clns_is deny

dialer-list 1 protocol clns_es deny

dialer-list 1 protocol bridge deny

you can then use access-list on the interface to filter the protocol traffic.