Cisco Router UPC Broadband

zorch

All,

Having a problem - changed out existing router for a Cisco 870.
I have set up WAN port for DHCP on FastEthernet4.

Port comes up - but the CISCO can't get an IP address.

SDM reports that there is no DHCP server responding.

Is there any know problems - have the new UPC modem on site.

Dont have a copy of the config handy - will try and get it later

Any Ideas?


think the config line on the port was was like

ip address dhcp client-id FastEthernet4


Thanks,

Alun

Do you have any ACL's on fa4 that could be blocking DHCP traffic?

zorch

...just checked - only saved a local copy of the config to the laptop before I started!

I will post up configs tonight

thanks

zorch

turned off firewall etc

still can get an ip address

FastEthernet4 config below

interface FastEthernet4
description $ES_WAN$$FW_OUTSIDE$
ip address dhcp client-id FastEthernet4
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip inspect DEFAULT100 out
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
no cdp enable


Anyone any help?

Moriarty

Tried shutting down the interface, powering down the upc modem for 30 seconds, powering the modem back on and then bringing the interface back up on the router?

Alun

zorch wrote: »

turned off firewall etc

still can get an ip address

FastEthernet4 config below

interface FastEthernet4
description $ES_WAN$$FW_OUTSIDE$
ip address dhcp client-id FastEthernet4
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip inspect DEFAULT100 out
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
no cdp enable


Anyone any help?

Can you post the contents of ACL 101, i.e. all the statements starting with "access-list 101 permit/deny ..." and all the ip inspect statements such as "ip inspect name DEFAULT100 <protocol name>".

zorch

Guys,

Thanks,

It was firewall - not allowing DHCP through - had the entry in - but not for 101

Working now

Alun

Good to hear it!