HTTP hang up problems

[stevezups]

Hi all,

I have a 2811 router and a Cat 3550 SMI running my VLANS. For some reason, random users will lose there connection to the internet. The web page will say "web site found, waiting for reply" but nothing happens. The user will still be able to access e-mail and local network resources. When the user reboots the computer, it works fine. This happens to rendom users and random times of the day. I have assured that there are no access-list preventing this traffic.

It doesn't matter which VLAN the users are connected to.

Does anyone have any ideas?

Thanks,

Stevan

[paddyxdoyle]

Hi,

What kind of connection to the internet do you have?

Have you looked at the counters on your internet connected interface for any errors

e.g. "show int serial 0/0"

What level is the processor on your router running at during these outages:

"show proc cpu"

Could it be being overloaded by some kind of virus outbreak? If you suspect this then using netflow on your router will help you determine this:

This can be enabled on your internal interface as follows

# interface fastethernet 0/0

# ip route-cache flow

To view netflow stats "sh ip cache flow"

Have a look at the following link for futher information on Netflow:

http://www.cisco.com/go/netflow

On a machine that loses connection, how far can your get when using traceroute to an internet site?

HTH

Paddy

[stevezups]

Hi,

The Intenet connection I have is a T1.

The level of processor on the router has been as low as less then 2 percent. "sh ip cache flow" does not display anything unusual, is there something I'm looking for? When I do a trace route to google, I can get to the google web site. The trace route finshes successfully. Below is the output of my sh serial interface.

Serial0/0/0 is up, line protocol is up

Hardware is GT96K Serial

Description: Internet

Internet address is 216.211.27.25/29

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 13/255, rxload 125/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:05, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/26/0 (size/max/drops/flushes); Total output drops: 7225

Queueing strategy: Class-based queueing

Output queue: 0/1000/64/7225 (size/max total/threshold/drops)

Conversations 0/14/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 155 kilobits/sec

5 minute input rate 757000 bits/sec, 84 packets/sec

5 minute output rate 81000 bits/sec, 63 packets/sec

9020690 packets input, 3047270441 bytes, 0 no buffer

Received 24633 broadcasts, 0 runts, 0 giants, 0 throttles

3 input errors, 3 CRC, 2 frame, 0 overrun, 0 ignored, 3 abort

7428631 packets output, 3283835132 bytes, 0 underruns

0 output errors, 0 collisions, 7 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

This is just a standard serial card connnected to an external CSU/DSU owned by the telephone company.