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ISDN bonding problem

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ciscopix77

Technical User
Sep 19, 2005
27
GB
Hi all

I have a 3com router, but am hoping someone here would help me out with this problem. we have 3 isdn lines (2 channels each) and when I try to bind two isdn channels to get 128k of bandwidth, I can dial into the router and it says 128k connected, but nothing happens. I cannot browse the internet, but funnily enough I can ping webpages! When I dial in using only one channel it works fine! I created the config so as to have 3 separate dialers for the 3 isdn lines. This is the config it has on:

Current configuration
!
3Com Router Software V1.30
local-user xxxx service-type ppp password simple xxxx
local-user xxx service-type ftp password simple xxxx local-user xxxxx service-type ppp password simple xxxxxx sysname xxxxxxxx
ppp mp binding-mode authentication
dialer-rule 1 ip permit
info-center console
firewall enable
aaa-enable
aaa accounting-scheme optional
ftp-server enable
!
acl 2000 match-order auto
rule normal permit source any
!
interface Aux0
async mode flow
link-protocol ppp
!
interface Ethernet0
ip address 192.168.1.40 255.255.255.0
nat outbound 2000 interface

!
interface Serial0
link-protocol ppp
!
interface Bri0
link-protocol ppp
ppp authentication-mode pap
ppp mp
isdn service data
isdn service speech
dialer enable-circular
dialer-group 1
dialer circular-group 0
!
interface Bri1
link-protocol ppp
ppp authentication-mode pap
ppp mp
isdn service data
isdn service speech
dialer enable-circular
dialer-group 1
dialer circular-group 1
!
interface Bri2
link-protocol ppp
ppp authentication-mode pap
ppp mp
isdn service data
isdn service speech
dialer enable-circular
dialer-group 1
dialer circular-group 2
!
interface Bri3
link-protocol ppp
ppp authentication-mode pap
ppp mp
isdn service data
isdn service speech
dialer enable-circular
dialer-group 1
dialer circular-group 3
!
interface Dialer0
link-protocol ppp
ppp authentication-mode pap
ppp mp
ppp mp max-bind 2
ip address 10.10.10.1 255.255.255.0
dialer enable-circular
dialer-group 1
dialer number ""
!
interface Dialer1
link-protocol ppp
ppp authentication-mode pap
ppp mp
ppp mp max-bind 2
ip address 10.10.11.1 255.255.255.0
dialer enable-circular
dialer-group 1
dialer number ""
!
interface Dialer2
link-protocol ppp
ppp authentication-mode pap
ppp mp
ppp mp max-bind 2
ip address 10.10.12.1 255.255.255.0
dialer enable-circular
dialer-group 1
dialer number ""
!
interface Dialer3
link-protocol ppp
ppp authentication-mode pap
ppp mp
ppp mp max-bind 2
ip address 10.10.13.1 255.255.255.0
dialer enable-circular
dialer-group 1
dialer number ""

!
quit
ip route-static 0.0.0.0 0.0.0.0 192.168.1.1 preference 60
ip route-static 192.168.5.6 255.255.255.255 Dialer 0 preference 60
ip route-static 192.168.5.7 255.255.255.255 Dialer 1 preference 60
ip route-static 192.168.5.8 255.255.255.255 Dialer 2 preference 60
ip route-static 192.168.5.9 255.255.255.255 Dialer 3 preference 60
!
return


It seems like its a bonding problem?? Any ideas as to what might be causing this?
 
My first inclination is that it's probably a bug in multilink. On Cisco devices, I've seen a few issues with multilink in the past.

Things I would look at would be:

1. Consider upgrading this router.
2. Confirm if necessary what you are dialing into. Is it a single access server or a pool of access servers. If a pool, check that MultiChassis Multilink PPP is correctly configured and operating correctly.
3. Try the connection again but with just one dialer interface. I don't think you need to create 3 dialers as you've done. All the BRI's belong to one dialer group only anyway so one dialer interface should suffice.
 
Hi

Thanks for the reply...I have checked the 3com website and unfortunately for me we have the newest version of the ios. I have tried it with one dialer, it works but ony allows access of one user at a time with 64k connection. I was hoping that more than one user can connect at a time (using one channel).

Any ideas?

Thanks
 
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