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New Member

871W killing connection speed

I have an 871W with IOS 12.4(24)T and Comcast cable internet. When I hook any of my computers directly up to the modem I get speed results anywhere from 1.7Mb/s to 6+Mb/s depending on the site I use for testing. When I connect to the 871W I can't even get close to 1Mb/s speeds on any sites. My duplex and speed on both WAN and LAN ports is 100/full. I have a bare minimum config on the router so that all it can do is move data from LAN to WAN. Wireless interface is turned off.

Anyone have any clue what the router is doing to kill my connection?

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: 871W killing connection speed

Please configure:

no ip source-route

interface FastEthernet4

no ip virtual-reassembly

interface Vlan1

no ip virtual-reassembly

no ip nat inside source route-map NAT interface FastEthernet4 overload

ip nat inside source rlist NAT interface FastEthernet4 overload

Failing that you ma want to look to switch a different IOS, eg 12.4(3j) or so.

7 REPLIES
Hall of Fame Super Gold

Re: 871W killing connection speed

Bare minimum config, meaning ?

Super Bronze

Re: 871W killing connection speed

"My duplex and speed on both WAN and LAN ports is 100/full."

Are all the ports configured auto/auto and they negotiate 100/full, or are some hard coded 100/full? If the latter, do all the hosts have matching port configurations (i.e. hard coded to hard coded, not auto to hard coded)?

New Member

Re: 871W killing connection speed

I've attached the config.

Computer and router ports are set to 100/full so no negotiating is going on.

Hall of Fame Super Gold

Re: 871W killing connection speed

Please configure:

no ip source-route

interface FastEthernet4

no ip virtual-reassembly

interface Vlan1

no ip virtual-reassembly

no ip nat inside source route-map NAT interface FastEthernet4 overload

ip nat inside source rlist NAT interface FastEthernet4 overload

Failing that you ma want to look to switch a different IOS, eg 12.4(3j) or so.

New Member

Re: 871W killing connection speed

I changed everything except for the ip nat statement and it worked. Thanks.

Hall of Fame Super Gold

Re: 871W killing connection speed

Very good, thanks for the nice rating and good luck!

Super Bronze

Re: 871W killing connection speed

"interface FastEthernet4

ip address dhcp

ip nat outside

ip virtual-reassembly

speed 100

full-duplex"

So this port is connected to a cable modem? If so, cable modem is configured 100/full?

Can you provide show interface stats for your active interfaces?

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