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460 posts

Ultimate Geek
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  #56885 4-Jan-2007 16:31
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To the best of my knowledge they do because ports are allocated to ISPs. That is why if you are waiting for a port to be freed up at your local exchange/cabinet then you can try another ISP and get up & running.

3 posts

Wannabe Geek

  #57711 12-Jan-2007 12:58
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Hey Quattro, as you know from GP I'm having the same problems with my ihug "broadband 3" plan. Since the 'unleashing', all large non-torrent files are corrupt, on both my mac and PC.

Ihug says they 'cannot lodge a fault until there are more complaints. At the moment it is just you.' They suggest checking my network card, although I've already explained I have two computers and so the problem is hardware independent.

Bizarre behavior from a company I've been with for over 5 years.

I have no idea what I can do next.


3539 posts

Uber Geek


  #57715 12-Jan-2007 13:14
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weblordpepe: To the best of my knowledge they do because ports are allocated to ISPs.

I have recently heard it is like this:

1)  XTRA have a block of ports reserved for their customers

2)  All other ISPs (who connect using UBS) have a block of ports reserved for their customers

Maybe someone else can correct me if I'm wrong but I have heard of cases where a customer was immediately disconnected from XTRA and could not connect to another ISP for some days until a port became free in the "Other ISPs" block.

It seems like an inflexible arrangement, but no doubt there are good reasons for it.

573 posts

Ultimate Geek


  #57717 12-Jan-2007 13:23
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Quattro: Am I the only one??

Ever since I changed to this plan when it came out I’ve had massive corruption issues where a large portion of downloaded files (regardless of type, the larger the more probable) end up corrupt, i.e. their md5’s don’t match, zips don’t extract etc.

I have been toying with xtra support since this problem began and they have yet to be of any help, recently they attempted to close the issue with this email:

Thank you for your email. We arent aware of any data corruption issue on our Go Large plan and havent had any other such reports from customers. All Go Large customers share a common boundary and we do not suspect this to be a network fault. We have liased with our networks team regarding this issue and no fault has been found. Your line is operating in peak condition as well. We strongly suggest you take a look at your hardware and firewall settings.

Best Regards,

Xtra Broadband.

Best regards indeed.

Given that this only started after changing from their ‘go’ plan to ‘go-large’ I have trouble believing it’s on our end, even so, I’ve tried everything: different modem, computer, cables etc, no change.

Now of course, since it’s go-large I also get dial up speeds with torrents and internationally, national speeds aren’t too much better, being in the order of 800kbit/s (with sync speeds of 3200). Previously, before go-large, 3200kbit/s was very much attainable, at least nationally. Since it seems xtra have given up on me I think its time to change… The first thing I’m doing it changing back to ‘go’ to see if the issue disappears, if so, then I’m going to make sure I get some compensation.
In any case, I think its time to change providers. The first company that came to mind was worldXchange, since we do tolls with them, but I just found out they don’t do any toll discounts… Even so, for $50 which is what ‘go’ would cost, xnet’s river is much better value for money.

Sorry for the rant, what I really want to know I suppose is am I alone in this problem??
And, as far as I can tell from other posts, Xnet is great, but is there anything else I should know? Or are there any other ideas on what I should do?

Are you relatively close to your exchange? what sync speeds do you get? if you're syncing at over 8000, you're probably on a high-power profile.

I had the same issue, where the signal strength was simply too STRONG. I was moved to a lower-powered profile, and has since been working fine at around 7.5 Mbit.


19 posts


  #57720 12-Jan-2007 13:40
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Hey tecumseh,

Yeah, it seems the ISPs are reasonable lost with this problem and as a result they offer solutions which we know wont fix anything (ive been asked if ive tried restarting my modem SO many times...). Now when i call up xtra and give my previous case number it takes them about 2 minutes to read through my case.

Ive replied in the GP thread, see if you can find out if you are in fact getting reported CRC errors (anyone here have a 302G and know how to get to the error log?), if so, then you are in exactly the same boat as me apart from being with Ihug (that worries me a bit, my backup plan was to go to Xnet to resolve the issues, but it seems its not ISP dependent).
 As you say, torrents work find, this is because of the inbuilt hash error check they have. What torrent client do you use? With uTorrent there is a log where such detected errors are displayed, the actual fraction of downloaded data which is found to be corrupt is also recorded, generally i get about 20% bad data, although it has been a lot higher.

I know how you feel though, we've been with xtra for ever (probably 8 or so years) but that doesnt seem to matter. It does seem to be worse for you though, the Xtra help desk never said anything about not being able to lodge a fault until they here of more people with the problem, maybe its just that Ihug have to go to xtra with issue, and need to be 100% sure there is in fact one, i dunno. But as you can see in my original post, i did get an email basically trying to close my case...

Ill keep you posted on how my port change goes, if it doesnt magically fix everything then maybe i just wasn’t meant to browse the internet...

In reply to willnz:

Thanks for the reply, im not sure how close i am, but i wish i was getting such speeds, my sync speed is generally around 3.2mbit so i dont think its that.

162 posts

Master Geek

  #57724 12-Jan-2007 14:10
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Hi guys, a few points

The unleashing of broadband has increased loading on the exchanges, and in some cases resulted in lower actual throughput, especially during busy periods.

A related if slightly less obvious point, letting everyone connect at max speeds increases the noise level in the cables and could concievably increase the number of errors you receive - especially if your cable pair is not in perfect condition, my connection speed has steadily declined over the many years I've had it through no fault of the modem / or cable pair.

Different routers connect at different speeds, and some are more fault tolerant than others, it can be worth trying a different one if possible, I have an ancient Nokia modem that connects a full 1M slower than my D-link, but is rock solid and has a better noise margin ( another figure worth checking )

If you think your problems are noise / interference related it may be possible for Telecom to reduce your sync speed for greater stability.

No Telecom would not normally change ports for a plan change, this is purely a configuration change, not a physical one.

If your problems are congestion related changing isp's may not help much unless some of the exchange bandwidth is reserved by Telecom for other ISP's (anyone?) otherwise you'd be using all the same Telecom hardware as you are now.

1549 posts

Uber Geek

  #57736 12-Jan-2007 17:32
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Hi there,

Just something to maybe look at in regards to the corruption you are getting .. you say it's just large files ?

Have you checked the network speed and duplex settings on the ethernet adapter of your PC ?  They'll need to match whatever you have on your ADSL router or if you are going to a switch the settings on that, if your router autonegotiates the speed (and 99% of the ones home users get do) then your PC must also autonegotiate (if your PC is hard set to say 100Mb/Full duplex then the ADSL router/switch might get it wrong and set itself to 100MB/Halfduplex), all sorts of wonderful issues happen when the settings don't match, it will look like you are OK and are connected but the adapters will be doing a lot of retries due to collisions which could lead you to seeing data corruption (though TCP should be seeing and fixing problems)

Just an idea :-)



19 posts


  #57739 12-Jan-2007 18:12
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Thanks for the reply,

Well i havent changed anything network related on any of the computers this is happening to so i dont think this would be the case, since they have worked fine previously.

3539 posts

Uber Geek


  #57741 12-Jan-2007 18:47
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Mark: ...if your router autonegotiates the speed (and 99% of the ones home users get do) then your PC must also autonegotiate (if your PC is hard set to say 100Mb/Full duplex then the ADSL router/switch might get it wrong and set itself to 100MB/Halfduplex), all sorts of wonderful issues happen when the settings don't match...

This is not correct.

If the ports are not set to the same speed, or cannot auto-negotiate so they are both on the same speed, NO communication AT ALL will be possible.

There is no way you can get data corruption from a misconfigured Ethernet adapter, they either work or they don't.  There is a lot of CRC checking on each packet and it is rejected with a retry being requested in the event of data errors.

I did strike one case however where the throughput was very slow because one particular Ethernet adapter did not like running in Full Duplex mode.

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