Sounds like a routing problem. As far as the 3com side goes the only thing that comes to mind is MTU settings. I have seen issues going to certain sites when the MTU isn’t set to 1500.
What’s a traceroute look like? Keep in mind some sites don’t allow you to trace to them (i.e. www.microsoft.com)
Are you using any routing protocols on the chassis? RIPv2/OSPF?
Todd
-----Original Message-----
From: usr-tc-bounces+berto=core.com@mailman.xmission.com
[mailto:usr-tc-bounces+berto=core.com@mailman.xmission.com] On Behalf Of Kirti S. Bajwa
Sent: Monday, July 25, 2005 7:31
PM
To: usr-tc@mailman.xmission.com
Subject: [USR-TC] RE: Dial-In
Problem!!!!
Hello:
Please help. This problem is going on for the last 7 weeks without fixing.
TC1000
1-HiPer NMC
2-HiPerARC
10-Hiper DSP
We are a small ISP (400 customers). We have 2-ISDN-PRI lines for our customers to dial in. Our entire system looks like this:
/
/ T1 to Internet Backbone
/
CISCO 26XX Router
|
HUB 10/100
|
---------------------------------------------------------------------------------------------------------
| | | | | |
NMC ARC1 ARC2 Web Authentication Internal Network
----------- 3Com ------------ Server email Server
| | | | | | | | | | | |
Customer Dial-In
Our customers can dial-in, are authenticated and can access the internal web site (www.tibonline.net) and retrieve their email. But when they try to connect to any web site (outside our network) on the external net (such as www.yahoo.com), they time out with a message saying that “this page can’t be displayed”.
We have changed the HUBs, RJ45 cables. We have the CISCO Router tested fine. Finally, I replaced the 3COM box with a backup box and the problem continues. Interestingly, we can access any Internet web site (www.msn.com, www.yahoo.com, etc.) from our internal network (over LAN) without problem.
I have called Sprint, who provides us with ISDN-PRI lines. They claim that the lines are testing OK.
Has anyone faced the similar problem? If YES, what was the solution?
Kirti