Cable Modem to Cisco 1700 Series

verbbbie2 · ‎03-06-2007

I have a Cisco 1700 Series router pluged into a cable modem; connection type coming from the cable modem is DHCP. I have DHCP enabled on E0 on the 1700 but I am getting a lot of errors on the interface. Does anyone have a sample configuration of a 1700 E0 facing a cable modem for DHCP connectivity?

spremkumar · ‎03-06-2007

hi

what kinda errors you are seeing on the interface ?

Are you seeing any CRC/Input/interface resets on the interface ?

can you post the output of show interface e0 here ?

Also did you try changing the cable connecting both the router and the cable modem ?

regds

verbbbie2 · ‎03-07-2007

Here is the sh int output. It is Cox Cable and the connection type is DHCP. I am not getting the IP address from the carrier it doesn't look like.

flashsplash · ‎03-07-2007

How can i view ur attachment?

verbbbie2 · ‎03-07-2007

should be able to open in paint or windows image.

flashsplash · ‎03-07-2007

Did u used the ip-helper address command to forward broadcast cause as u know a router doesn' t forward broadcast pakkets?

ps: can u please paste a screen-shot of ur start or running config

verbbbie2 · ‎03-07-2007

Here is the running config. I did not use the IP-Helper

------------------ show running-config ------------------

Building configuration...

Current configuration : 1360 bytes

!

version 12.2

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname PARADIS_1700

!

logging queue-limit 100

!

ip subnet-zero

!

ip dhcp excluded-address 192.168.1.1 255.255.255.0

ip dhcp excluded-address 192.168.1.2 192.168.1.99

ip dhcp excluded-address 192.168.1.150 192.168.1.254

!

ip dhcp pool PARADIS

network 192.168.1.0 255.255.255.0

default-router 192.168.1.1 255.255.255.0

dns-server 68.9.16.30 68.9.16.25 68.100.16.30

!

ip audit notify log

ip audit po max-events 100

!

class-map match-all paradis

match access-group name PARADIS

!

policy-map Paradispolicy

class paradis

!

interface Ethernet0

ip address dhcp

service-policy input Paradispolicy

service-policy output Paradispolicy

half-duplex

!

interface FastEthernet0

ip address 192.168.1.1 255.255.255.0

service-policy input Paradispolicy

service-policy output Paradispolicy

speed 100

full-duplex

!

ip classless

ip route 0.0.0.0 0.0.0.0 68.229.82.1

no ip http server

no ip http secure-server

!

ip access-list extended PARADIS

permit tcp any any eq 2869

permit tcp any any eq 10243

permit udp any any eq 1900

permit udp any any range 10280 10284

!

no cdp run

!

line con 0

line aux 0

line vty 0 4

exec-timeout 30 0

privilege level 15

password

login local

transport input telnet

!

end

verbbbie2 · ‎03-07-2007

Can you tell me what the configuration should look like?

Danilo Dy · ‎03-07-2007

The carrier is an electrical signal that Ethernet devices use to detect whether the wire is currently being used by another transmitting station.

The lost carrier counter increases each time a carrier sense loss occurs. This happens when the hardware is transmitting a frame onto the wire and does not see its own carrier wave on the Ethernet

verbbbie2 · ‎03-07-2007

We were testing is why the lost carrier; we kept switching cables and plugging the cable back into his existing Linksys when we needed internet back up

flashsplash · ‎03-08-2007

what kind of error are u getting from ur Ethernet interfaces?