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Inter-ISP routing issues

N/A

Inter-ISP routing issues

Both yesterday and today, I have had major routing issues from work, while trying to access any +Net service, including e-mail, portal, FTP plus each and every static customer IP (including my own).

We currently use BT Openwoe for our works connection (How long does it take to install a peice of CAT5 so I can run a new DSL feed off our FAX line).

I have reported to both ISPs, that routing is cut off mid way, making only a single hop (the next hop past my router) correctly, before nothing else is returned.

This has made for impossible work today, as some much need files could not be obtained from my home system.

Can +Net confirm that my issue is being investigated (I suspect yes)?

Can they confirm if the issue has been confirmed?

Do you know if it is related to the emergancy work tomorrow?

Many thanks
8 REPLIES
N/A

Inter-ISP routing issues

I have had similar issues in not being able to access the portal, my domain and any +net site (except Usenet Huh). Raised the usual ticket and got the usual run around of "delete cache", "try another browser", DNS setting etc.
Funny thing is, I have no problem using the backup Dial in !!!
Therefore, conclusion is - must be +net and is related to the recent announcement and the work to be done in morning.
N/A

Inter-ISP routing issues

My issues are related to external connectivity, from a seperate ISP, and not from +Net DSL to the portal.

It tool me 45 mins to raise the contact us ticket today, using my backup dial-in and a 9660 mobile phone connecion.
jberry
Grafter
Posts: 1,886
Registered: 08-06-2007

Inter-ISP routing issues

Hi there,

This will all be due to the problem affecting the speed of access to mail, websites and the portal that is currently in service status. We are performing some maintenance tommorow morning to resolve this issue.

Regards,
N/A

Inter-ISP routing issues

I must ask then, would this be causing the issue with making a connection to my static IP from BTO.

If so, the problems discription didn't quite cover it.
jberry
Grafter
Posts: 1,886
Registered: 08-06-2007

Inter-ISP routing issues

Hi there,

The problem is localised to our network in Sheffield so a connection from an ADSL line to somewhere outside of our network should not be affected, you should at least be able to trace to the IP address.

Use of the Contact Us system would be affected since this is on our network in Sheffield.

Regards,
N/A

Inter-ISP routing issues

Then this is a seperate issue.

To send in my contact ticket, I had to use dial-up from my mobile phone and laptop. While the slowest thing I have ever seen (maybe I might try MOHAA on it Tongue ), it got the job done.

In my contact us ticket, it shows several routing failures, all stopping at the same point.

While I can't quote tickets, here is the output from the traceroute (obtained reading my ticket).


Traceroute to the portal. Which you say is in Shefield.
Quote

Traceroute to "portal.plus.com" [212.159.8.137]
1 <1ms <1ms <1ms pri.gateway.c-r.lan [192.168.254.253]
2 32ms 31ms 31ms btdhg517-hg2.ealing.breaodband.bt.net [217.47.50.201]
3 32ms 31ms 32ms 217.47.50.129
4 33ms 32ms 35ms 217.47.50.234
5 33ms 33ms 33ms inh3cs01-500.imsnet3.btopenworld.com [213.1.119.61]
6 32ms 32ms 32ms btfl03-gig8-7.imsnet3.btopenworld.com [213.1.119.153]
7 33ms 34ms 37ms core1-pos12-1.ealing.ukcore.bt.net [194.72.9.197]
8 35ms 33ms 34ms core1-pos10-0.redbus.ukcore.bt.net [194.74.65.254]
9 *timeout*
10 *timeout*
Repeated timeouts, all the way until the default 30 hop limit


Traceroute to my home DSL connection "acarr.plus.com"
Quote

Traceroute to "acarr.plus.com".
1 <1ms <1ms <1ms pri.gateway.c-r.lan [192.168.254.253]
2 32ms 31ms 31ms btdhg517-hg2.ealing.breaodband.bt.net [217.47.50.201]
3 32ms 31ms 32ms 217.47.50.129
4 33ms 32ms 35ms 217.47.50.234
5 33ms 33ms 33ms inh3cs01-500.imsnet3.btopenworld.com [213.1.119.61]
6 32ms 32ms 32ms btfl01-gig7-7.imsnet3.btopenworld.com [213.1.119.145]
7 33ms 34ms 37ms core1-pos12-1.ealing.ukcore.bt.net [194.72.9.197]
8 35ms 33ms 34ms core1-pos10-0.redbus.ukcore.bt.net [194.74.65.254]
9 *timeout*
10 *timeout*
Repeated timeouts, all the way until the default 30 hop limit

Note: The ping times are exactly the same, you don't see that very often.

Using dial-up via the latop and a mobile phone into +Net, i tried tracing back to the BT O connection, which is normaly fine to do.

Quote

Traceroute "81.136.208.50"
1 779ms 816ms 835 ms pth-ag1.plus.net [195.166.128.4]
2 819ms 847ms 1342ms gi1-2.vlan7.pth-gw4.plus.net [212.159.1.211]
3 *timeout*
4 *timeout*
Repeated timeouts, all the way until the default 30 hop limit


Note how it makes it no further than 2 hops.

Here is a fresh traceroute from my DSL connection
Quote

traceroute to 81.136.208.50 (81.136.208.50), 30 hops max, 38 byte packets
1 192.168.1.1 (192.168.1.1) 0.969 ms 0.849 ms 0.809 ms
2 pth-ag2.plus.net (195.166.128.6) 16.567 ms 16.797 ms 16.215 ms
3 gi1-2.vlan3.pth-gw4.plus.net (212.159.1.3) 166.090 ms 16.720 ms 22.143 ms
4 *timeout*
5 *timeout*
Repeated timeouts, all the way until the default 30 hop limit


As such, all connections into any part of the +Net network from BT O is hitting a dead stop.

What I have shown above is clear proof there is a issue, that shouldn't exist. However, it seems hard to be authenticated by yourselves.

I can understand you normaly need more than 1 customer sayign there is an issue, but there is very doubtfully goign to be more than 1 trying to do what I am.
Ianwild
Grafter
Posts: 3,835
Registered: 05-04-2007

Inter-ISP routing issues

Hi There,

This unfortunately looks like a problem with routes outside of both ours and BT's network. Probably at Linx. You could try the tools at http://www.linx.net/tools/index.thtml to try and pin down where the routing is going wrong, but if you have a ticket open showing all this we will also make investigations and representations to third parties where required.

The other thing I was going to add is that we have significantly reduced our objection to people posting Contact Us tickets in public, so feel free to do this if:

1. It is 'in the public interest' - IE please summarise where possible to make it easier on everyone to read.

2. You must not post the names of agents in public without express prior permission (And if it's my name you already have it!).

Regards,
N/A

Inter-ISP routing issues

Further to this, I can now say it was a +Net issue (sort of).

A block had been put in place, prevented any and all traffic. This was apparently (can't dismiss it yet) due to some form of exploit / DOS (not clear yet) against the FTP service at +Net, from our BTO account.

I more than certain that a virus is not to blame, due to the mesures we take. These include daily full scans, including hauristics using AVG (at 5pm daily, when we leave for home), and two scans throughout the week using online scanners (Panda and Norton).

While these won't gurantee us clean, it does go more than a long way.

There is only myself that uses FTP in our office (the office in question, has only 5 staff), and I do from time to time use the +Net ftp server, mainly while uploading some test tools and files, for the use of show-and-tell here at the forum.

I use Web folders (Windows built in FTP client) and Edit+.

So far, I could only see it being an issue in one of these two clients.

I have returned to the block being removed. They said this was only possible if I could provide assurances. While I couldn't provide this, I beleive I had supplied enough details to discount most fears around it.

The investigation continues at both ends.