using a single BRI B Channel to connect two Routers

[aebert]

I have twou routers connectet via ISDN

Zyxel -------------------- Cisco 1600

When I do a PING from the Zyxel to the Cisco box, I receive the ping reply on the second b channel. How can i prevent this behaviour?

I only want to use a single channel.

Thanks

[makchitale]

Need to ensure who makes the call on the B2.......If the Cisco 1600 is making a call on the B2 channel back to the Zyxel & to stop this ensure we do not have the following in the config on the 1600 (under the bri or dialer interface):

Called number in Dialer map command or dialer string.

dialer load-threshold xxx

ppp multilink

debug dialer / deb isdn q931 / deb ppp nego on the 1600 will be useful.

Thanks, Mak.

[nuno.morais]

Hi.

Assuming you are using PPP between both routers, you should use authentication (PAP or CHAP). Otherwise the Cisco has no way to know that the ISDN B channel already opened is the way to reach the Zyxel router and it will establish a call on the next available B channel (#2).

Hope this helps.

NM

[aebert]

authentication CHAP is configured... :-(

[nuno.morais]

Hi.

Ok, if authentication is configured check what Mak said on its posting.

Rgds.

NM