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Author Topic: Challenge for any computer people  (Read 2462 times)

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JamesV6CDX

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Challenge for any computer people
« on: 12 October 2007, 16:54:07 »
Customer has a 4mb leased line (2x 2mb Bonded)

Helpdesk escalate a call to me after doing the usual reboots and rubbish , customer has some web browsing problems.

Customer can get to some websites fine, but cannot reach others. I Get a list off the customer of what he can access and what he can't.

I telnet to his router, (cisco 2600), I can ping out to the websites he says he can access, but I can't ping to the ones he is unable to browse to. And they ARE configured to respond to ICMP.

No proxy or ISA servers etc involved.

Telnet to A end core router the line is provided from, can resolve and ping those sites without a problem.

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miked

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Re: Challenge for any computer people
« Reply #1 on: 12 October 2007, 17:29:07 »
sorry,

once again...
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cem_devecioglu

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Re: Challenge for any computer people
« Reply #2 on: 12 October 2007, 17:41:29 »
ping does not use ICMP  ? .. :-?

I'm confused..
« Last Edit: 12 October 2007, 17:43:48 by cem_devecioglu »
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JamesV6CDX

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Re: Challenge for any computer people
« Reply #3 on: 12 October 2007, 17:43:33 »
Quote
ping does not use ICMP .. :-?

I'm confused..

Ping is a computer network tool used to test whether a particular host is reachable across an IP network. It works by sending ICMP “echo request” packets to the target host and listening for ICMP “echo response” replies.
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cem_devecioglu

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Re: Challenge for any computer people
« Reply #4 on: 12 October 2007, 17:46:05 »
Quote
Quote
ping does not use ICMP .. :-?

I'm confused..

Ping is a computer network tool used to test whether a particular host is reachable across an IP network. It works by sending ICMP “echo request” packets to the target host and listening for ICMP “echo response” replies.

I know ping works with ICMP but how for the second dont work ?

ps: network protocols are not my subject but its opposite what I know so far
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Paul M

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Re: Challenge for any computer people
« Reply #5 on: 12 October 2007, 18:32:00 »
Tried a traceroute to see where the packets are dropping? Of course this uses ICMP too so suffers the same potential problems with firewalls dropping them but if you can ping the sites from elsewhere it should be useful. BTW I'd be a little concerned that he has telnet enabled on his router... SSH maybe but telnet :o
« Last Edit: 12 October 2007, 18:34:21 by Paul_M »
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smoothomega

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Re: Challenge for any computer people
« Reply #6 on: 12 October 2007, 20:29:58 »
I think the problem lies with the jiggle pin, its not in sync with the jam centre and thus creating a log jam in the never ending circle of life. Hope this helps.  :y  ;D ;D ;D
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Taxi_Driver

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Re: Challenge for any computer people
« Reply #7 on: 12 October 2007, 20:37:16 »
Post up if you fix it James.....otherwise i'll ask my neighbour in the morning......he's one of those cisco buffs.....thats earns a fortune....if he thinks its a router problem  :y No good phoning him now....its Fri night and he'll been in the pub for about 3 hours by now  ;D
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ffcgary1

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Re: Challenge for any computer people
« Reply #8 on: 12 October 2007, 20:38:50 »
I,ll get me coat!  mrs ffcgary1 says= she knows the basics,are there any sites blocked,and have you run all the normal spyware progs. ;D
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VXL V6

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Re: Challenge for any computer people
« Reply #9 on: 12 October 2007, 20:43:43 »
Perhaps the remote site has blacklisted traffic from your customers domain (rDNS lookup to ascertain).

Can your customer send emails to them?



« Last Edit: 12 October 2007, 21:00:08 by VXL_V6 »
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JamesV6CDX

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Re: Challenge for any computer people
« Reply #10 on: 12 October 2007, 22:17:36 »
Cheers, guys, however above suggestions all tried :)

I have my suspicions what is causing the prob, I will know for sure tomorrow when I can actually be arsed to look into it ;D


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TheBoy

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Re: Challenge for any computer people
« Reply #11 on: 12 October 2007, 22:26:58 »
Depends how the bonding is done - is traffic over 1 line ok, but over the other one not working?  If its bonded by 'load balanacing' by destination IP (eg odd/even last octet), some hosts reachable, some not?


Or a config error on the bonding which means replys coming down wrong half of it?

Need to know more about the bonding...
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cem_devecioglu

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Re: Challenge for any computer people
« Reply #12 on: 12 October 2007, 22:31:31 »
same for my job. I can reach my job website, but cant ping.. > Firewall
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JamesV6CDX

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Re: Challenge for any computer people
« Reply #13 on: 12 October 2007, 23:18:58 »
Quote
Depends how the bonding is done - is traffic over 1 line ok, but over the other one not working?  If its bonded by 'load balanacing' by destination IP (eg odd/even last octet), some hosts reachable, some not?


Or a config error on the bonding which means replys coming down wrong half of it?

Need to know more about the bonding...

By very far the closest answer so far ;)

I am very close to fixing this one... and tomorrow, once I have done a couple more tests, I will know for sure.

Obviously I will post up the results.

This year has been a BIG Cisco learning curve for me!
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JamesV6CDX

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Re: Challenge for any computer people
« Reply #14 on: 12 October 2007, 23:25:54 »
Quote
BTW I'd be a little concerned that he has telnet enabled on his router... SSH maybe but telnet :o

All our customers have telnet enabled by default on their CPE - standard Cisco kit.

Authentication is wilth Terminal Access Controller Access-Control System (TACACS), so a little more secure..


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