Anybody know about Cisco routers?

[Bexy]

I've recently acquired a Cisco 837 router and I'm trying to configure it to connect to my ISP (Plusnet) but there seems to be a problem with the routing and I don't really have enough knowledge about Cisco routers to know how to fix it.

Can anyone help?

[saint_stevo]

you got an I.P for it from your ISP?

[Bexy]

I've got the IP from Plusnet but when I run the connection test it tells me that I need to configure either a user-specific or a default route to work with the ADSL interface, and I don't know what information I need in order to do that.

[saint_stevo]

i guess u have wiped it since 'acquiring' it?

[Bexy]

It was factory defaulted when I got it. Bought it off ebay for £35, hence I don't have a support contract with Cisco themselves.

[saint_stevo]

hmmmmm and google kicks up nothing.

EDIT- try some of this?

Mentions setting it up for DSL

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a008071a8bc .shtml

[Bexy]

I had a look and tried inputing the IOS command like it says on that page but the router doesn't like the command for some reason. I tried it a few times. This is doing my swede in now, I've been messing about with this for the best part of two days!!!!!!

[Bexy]

Cheers for the assistance anyway Stevo.

[Saint In Exile]

I had a look and tried inputing the IOS command like it says on that page but the router doesn't like the command for some reason. I tried it a few times. This is doing my swede in now, I've been messing about with this for the best part of two days!!!!!!

Which command is it failing on??

The process in the link provided is correct but you need to replace <vpi/vci> at step 6 with 0/38.

Do you want the router to also act as a DHCP server for your local network? If so, then you need to complete the optional setup at step 8 as well. I take it you know what IP range you're wanting to use for any local lan and what IP address you want to allocate to the local lan ethernet interface on the router?

[Bexy]

Which command is it failing on??

The process in the link provided is correct but you need to replace <vpi/vci> at step 6 with 0/38.

Do you want the router to also act as a DHCP server for your local network? If so, then you need to complete the optional setup at step 8 as well. I take it you know what IP range you're wanting to use for any local lan and what IP address you want to allocate to the local lan ethernet interface on the router?

Yeah I've done all that. It's set up as a dhcp server and kicking out IP adresses to the LAN clients OK. I've set the pvc values (0/38) and that's showing OK. It just doesn't let me add the default route, or it does but when I run the connection test using the SDM software it falls down at the 'checking exit interface' stage which means it doesn't have a default route to send the external traffic to.

I've checked with Plusnet and they tell me that they have 5 different servers that I could connect to each time I log in so it's not possible for them to provide me with a 'next hop' IP address.

[Saint In Exile]

Yeah I've done all that. It's set up as a dhcp server and kicking out IP adresses to the LAN clients OK. I've set the pvc values (0/38) and that's showing OK. It just doesn't let me add the default route, or it does but when I run the connection test using the SDM software it falls down at the 'checking exit interface' stage which means it doesn't have a default route to send the external traffic to.

I've checked with Plusnet and they tell me that they have 5 different servers that I could connect to each time I log in so it's not possible for them to provide me with a 'next hop' IP address.

Do they require you to connect with a username and password?

[Bexy]

Do they require you to connect with a username and password?

Yes

[Saint In Exile]

Yes

Give this config a go... Just change the bits between the <..> to the correct values for your setup.


no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers
!
hostname <Enter-adsl-router-name>
!
boot-start-marker
boot-end-marker
!
logging buffered 16256 debugging
logging rate-limit 15
enable secret <enter-secret-password>
!
clock timezone GMT 0
clock summer-time BST recurring 3 Sat Mar 1:00 last Sun Oct 2:00
no aaa new-model
!
!
ip subnet-zero
no ip source-route
ip cef
!
!
!
!
no ip bootp server
!
!
interface ATM0/0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no ip mroute-cache
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
!
interface FastEthernet0/0
description LAN
ip address <enter-local-lan-ip-address> <enter-local-lan-subnet-mask>
speed 100
full-duplex
ip nat inside
!
interface Dialer1
ip address <enter-ip-address-allocated-by-isp> <enter-subnet-mask-allocated-by-isp>
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
encapsulation ppp
dialer pool 1
dialer idle-timeout 0
no cdp enable
ppp chap hostname <enter-isp-username>
ppp chap password <enter-isp-password>
ppp pap sent-username <enter-isp-username> password <enter-isp-password>
ppp ipcp dns request
ppp ipcp route default
ppp ipcp address accept
!
!
!
ip nat inside source list 1 interface Dialer1 overload
no ip http server
no ip http secure-server
ip classless
!
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
!
access-list 1 permit <enter-local-lan-subnet-address> <enter-local-lan-reverse-mask>
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
!
!
end

[Bexy]

Thanks for the help so far guys, it's been very vaulable.

Right, I've made a bit of progress but I'm still a bit stumped. The router is by all accounts connecting to the ISP OK. The connection tests on the SDM tool are passing as successful and using hyperterminal I can ping the DNS server OK, but that's it. Neither of the PCs on the ethernet are able to connect to the outside world even though they are both connected to the router and receiveing an IP address over DHCP. If I try running a tracert on the IP address of the DNS server from my PC, it only gets as far as the router so there is obviously a problem somewhere between the ethernet and the exit interface on the router.

Anybody got any ideas?

[Saint In Exile]

Thanks for the help so far guys, it's been very vaulable.

Right, I've made a bit of progress but I'm still a bit stumped. The router is by all accounts connecting to the ISP OK. The connection tests on the SDM tool are passing as successful and using hyperterminal I can ping the DNS server OK, but that's it. Neither of the PCs on the ethernet are able to connect to the outside world even though they are both connected to the router and receiveing an IP address over DHCP. If I try running a tracert on the IP address of the DNS server from my PC, it only gets as far as the router so there is obviously a problem somewhere between the ethernet and the exit interface on the router.

Anybody got any ideas?

Sounds like a routing problem... Have you checked that the default route is correct? If that looks ok, can you ping and traceroute to 216.239.59.103 (www.google.co.uk) from the router?

[Bexy]

Sounds like a routing problem... Have you checked that the default route is correct? If that looks ok, can you ping and traceroute to 216.239.59.103 (www.google.co.uk) from the router?

YAY! I've sussed it now! I didn't realise that I had to create a NAT rule to associate the ethernet with the Dialer1 interface but I've done that now and it's working. Thank fook for that, I've been tearing my hair out over the last two days with this.

Thanks for your help mate, that config that you posted really helped. :)

[Saint In Exile]

YAY! I've sussed it now! I didn't realise that I had to create a NAT rule to associate the ethernet with the Dialer1 interface but I've done that now and it's working. Thank fook for that, I've been tearing my hair out over the last two days with this.

Thanks for your help mate, that config that you posted really helped. :)

No worries... Glad it's sorted!!