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Comment by freitasm, on 6-Jun-2008 14:02
OTOH it's wise to not use port 80 unless really it is http traffic, right?
Comment by sleemanj, on 6-Jun-2008 14:12
A-bloody-men to that. That crappy transparent proxy of TelstraClear has caused me much lost hair in the past. Unreliable interferring piece of shit it is.
Comment by tonyhughes, on 6-Jun-2008 14:46
Holding back on telling us how you really feel about the situation isn't going to help anyone.
Try opening up, be expressive, maybe even swear a little.
Comment by xcubed, on 6-Jun-2008 16:11
We had similar issues with Slingshot a while back. The trouble is that these ISPs are implementing the proxies in two parts: the redirection to the proxy, then the proxy itself. (Although really they should keep their mits off HTTP traffic completely. If they want to cache web traffic they should build a CDN or host an Akamai box)
If I send a request to 184.108.40.206 from 220.127.116.11, their firewall discards the 18.104.22.168 replacing it with the IP of the proxy server. This means that the proxy only sees a request from 22.214.171.124 with no idea where it was originally destined to go to (other than parsing the HTTP headers).
If they were smart about how they implemented it, the proxy would not need the redirection in front, so it would see that the original request was destined for 126.96.36.199 and be able to forward it there without having to do any DNS requests.
Alternatively, they should just let customers opt out.
Transparent proxies are a PITA.
Comment by olof, on 6-Jun-2008 17:31
Ok, I work for TelstraClear, so I guess I will be getting flamed now. Kevlar vest on :-)
Transparent proxies are really a double egded sword. There are only two reasons why we have implemented them in the first place:
1) Improve customer experience
2) Lower international bandwidth costs
Obviously, keeping content close to customers reduces latency and improves performance. However, as we all know, transparent proxies can sometime cause issues. However, in general transparent proxies greatly improves customer HTTP experience. Especially when you as in NZ live at the very edge of the internet with high latencies to the US.
As you can imagine, international bandwidth is one of the primary costs in providing broadband to customers. The ongoing video/media revolution, with YouTube and the likes, is obviously driving bandwidth consumption even further.
And by the way, we do host CDNs. For example, we are hosting Akamai. (And you will notice a huge performance gain when using Akamized content, such as Apple's trailers.)
Comment by insane, on 7-Jun-2008 23:55
if you call up you might find they have provisioned a way to get around it. One of the ISP's I have a connection through allows me to place a '?' eg. http://www.trademe.co.nz?/ at the end of the URL to bypass the proxy. Telstra might do something similar...
Comment by bill, on 30-Jun-2008 08:21
I just figured out that Slingshot are using transparent proxy as OpenDNS was not blocking sites as expected. I thought it was strange that a request to asdgff.dfgdf.dfsg for example was coming back with html code not a dns error or the OpenDNS page. But if I tried asdgff.dfgdf.dfsg:1234 I got to the OpenDNS "site not found". Which NZ ISP don't use transparent proxies? I thought OpenDNS would be a easy and free way to control my son's access to the internet. I guess I going to have to use a commercial piece of software to control what he stumbles across. Cheers Bill
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