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Community Member

E1 to Obtain IP from DHCP

I bought a Cisco 806 Router and I'm having trouble getting E1 to obtain the IP address from Cox Communications via cable modem. I've tried the default settings, as well as custom settings. I've upgraded the IOS to c806-sy6-mz.122-4.xm.bin. When I "debug dhcp", I get:

00:01:45: DHCP: SDiscover attempt # 1 for entry:

00:01:45: DHCP: SDiscover: sending 306 byte length DHCP packet

00:01:45: DHCP: SDiscover 306 bytes

00:01:45: B'cast on Ethernet1 interface from 0.0.0.0

00:01:48: DHCP: SDiscover attempt # 2 for entry:

00:01:48: DHCP: SDiscover: sending 306 byte length DHCP packet

00:01:48: DHCP: SDiscover 306 bytes

00:01:48: B'cast on Ethernet1 interface from 0.0.0.0

00:01:51: DHCP: SDiscover attempt # 3 for entry:

00:01:51: DHCP: SDiscover: sending 306 byte length DHCP packet

00:01:51: DHCP: SDiscover 306 bytes

00:01:51: B'cast on Ethernet1 interface from 0.0.0.0

00:02:01: DHCP: deleting entry 80C67E30 0.0.0.0 from list%Unknown DHCP problem. No allocation possible

Cox Communications said that they could see the DHCP request and even told me the MAC address of the router, but they said that the router is the problem because it's not holding the address.

If anyone has any suggestions, any help is appreciated.

3 REPLIES
Community Member

Re: E1 to Obtain IP from DHCP

I had a problem with my cable modem provider until I matched the hostname to the name they specified for my network. I didn’t look at the debugs so I don’t know where it was failing. Other than that, you might want to talk to Cisco’s support team.

Community Member

Re: E1 to Obtain IP from DHCP

i am facing the same problem, so if someone can tell me what i am doing wrong that would be nice.

the only difference is i have a 1605R. ios 12.2.6a

Community Member

Re: E1 to Obtain IP from DHCP

I had to change the configs on my ethernet1. Before I changed them, all that was there was "ip address dhcp". I had to add the last part. Once I added that, it started working.

interface Ethernet0

description Connection to LAN

ip address 10.10.10.1 255.255.255.0

ip nat inside

no cdp enable

hold-queue 32 in

hold-queue 100 out

!

interface Ethernet1

description Connection to Cox-Internet

ip address dhcp client-id Ethernet1 hostname gw-coxinternet-cable

ip nat outside

no cdp enable

!

ip nat inside source list 102 interface Ethernet1 overload

ip classless

ip http server

ip pim bidir-enable

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