I'm lost on how to get a Cisco 877M-K9 to work with a DSL connection. We have been allocated the network 84.a.b.120/29 and have been given the network 83.x.y.216/30 for routing. The external interface of our cisco is supposed to have the IP 83.x.y.217 and our default gateway i.e. the ISP DSLAM has the IP 83.x.y.218.
If I use a cheap consumer DSL in bridging mode and give my laptop the IP 83.x.y.217 with netmask 255.255.255.252 and let my default gateway be 83.x.y.218, then I can access the internet without a problem. Hence, the line works. The same DSL link also works if I put the cisco in bridging mode, so the problems seems to be getting the IP packets where they belong in routing mode.
Thanks in advance.
The configuration for my Cisco is as follows:
Current configuration : 1205 bytes ! ! Last configuration change at 18:28:18 EET Sat Feb 20 2010 ! NVRAM config last updated at 18:29:19 EET Sat Feb 20 2010 ! version 15.0 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname cisco877mk9 ! boot-start-marker boot-end-marker ! ! no aaa new-model clock timezone EET 2 clock summer-time EEST recurring ! ! dot11 syslog ip source-route ! ! ip cef ! ! username .... ! ! interface ATM0 ip address 83.x.y.217 255.255.255.252 no atm ilmi-keepalive dsl operating-mode adsl2+ annex M pvc 0/100 protocol ip 83.x.y.218 (I've also tried without this line) encapsulation aal5snap ! ! interface FastEthernet0 ! interface FastEthernet1 ! interface FastEthernet2 ! interface FastEthernet3 ! interface Vlan1 ip address 84.a.b.121 255.255.255.248 ! ip forward-protocol nd no ip http server no ip http secure-server ! ip route 0.0.0.0 0.0.0.0 83.x.y.218 ! ! ! ! ! control-plane ! ! line con 0 no modem enable line aux 0 line vty 0 4 login ! scheduler max-task-time 5000 end
No ideas yet? Any help would be appreciated as the site this router is for is currently without connectivity. I was also wondering why most configurations use something along the lines of:
no ip address
no atm ilmi-keepalive
dsl operating-mode adsl2+ annex M
interface ATM0.1 point-to-point
ip address 83.x.y.217 255.255.255.252
protocol ip 83.x.y.218
instead of just:
interface ATM0 ip address 83.x.y.217 255.255.255.252 no atm ilmi-keepalive dsl operating-mode adsl2+ annex M pvc 0/100 protocol ip 83.x.y.218 encapsulation aal5snap
What's the point of having this ATM0.1 point-to-point interface if you only have one ATM link from your router? Are you supposed to configure the router this way without specifying the IP address information for the ATM0 interface itself? I haven't tried the above configuration with the router yet (I don't have physical access to it).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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