01-05-2011 09:37 AM - edited 03-04-2019 10:57 AM
Hi All,
I've got a customer who has a Cisco 877 router connected to the Internet via ADSL with an account from a company called Gateway. The router is handling web browsing for about 15 clients on the LAN and is also port forwarding https (OWA) and PPTP to an Internal server. Over the last few days we have had major issues with the router / Internet connection.
This normally happens anywhere between 30 mins to an hour after the router is rebooted. When the above happens, I get kicked out of telnet (from externally) but I can reconnect using straight away and I can VNC (using port forwarding) to the Internal server. I've tried shutting down the ATM, VLAN1 and Dialer0 interfaces and restarting them, but it doesn't help, the only way I've found to sort it out is to do a reload on the router. I've tried setting the mtu and adjust-mss, but these have made no difference.
This also happened just before Christmas (when the site had a 837), we replaced the 837 with a 877 and the problem seemed to go away, but now it's back, I think it was because things were quiet over the holiday period.
Can anyone suggest where I should be looking to try and sort this problem.
Thanks
Maurice
01-05-2011 11:29 AM
Hi,
I get kicked out of telnet (from externally) but I can reconnect using straight away
What do you mean by that?
Regards.
Alain.
01-05-2011 11:49 AM
As I am not on site, I telnet in to the router using the Public IP address to monitor the router (temporarily allowed while trying to sort this out), when it goes wrong the telnet session disconnects, but I can telnet back in straight away.
Maurice
01-05-2011 11:56 AM
Hi,
Can you do this:
logging buffered info
clear log
show log to verify it's enabled and empty
then wait till disconnects and when telnet is back again do a show log and post results here.
Regards.
Alain.
01-05-2011 02:27 PM
The link stayed up for just over an hour this time, my telnet and pptp session dropped out, I can reconnect using telnet but not pptp and web browsing from the Internal network is also down, as is Outlook web access from the Internet.
One thing that's strange is that I can still VNC to the server on the Internal network (5900 is forwarded), but it does drop out after a minute or so, but it does let me reconnect.
The log shows nothing
Ealing877-2#show log
Syslog logging: enabled (0 messages dropped, 2 messages rate-limited,
0 flushes, 0 overruns, xml disabled, filtering disabled)
No Active Message Discriminator.
No Inactive Message Discriminator.
Console logging: level critical, 0 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 32 messages logged, xml disabled,
filtering disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: disabled
Persistent logging: disabled
No active filter modules.
ESM: 0 messages dropped
Trap logging: level debugging, 36 message lines logged
Log Buffer (51200 bytes):
01-05-2011 02:34 PM
Another bit of info to throw into the mix, I've set up forwarding on tcp 3389 to the Internal server for RDP, when I cannot web browse / pptp I can still RDP into the server, but it won't stay up for more than a minute or two, it then either hangs or disconnects and reconnects.
Why does VNC / RDP partly work, but pptp / http doesn't ? Could it be to do with packet size ? or the amount of data ?
Maurice
01-05-2011 11:53 PM
Hi,
Buffer logging: level debugging, 32 messages logged, xml disabled,
There was messages logged so it is strange you see nothing did you scroll down your screen?
Without debugs or log messages or a traffic capture it's difficult to diagnose.
Regards.
Alain.
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