Add comcast domain

[JasonRivers]

Comcast run a steam CDN, We have people in the US complaining that the cache isn't being hit on Comcast networks.

[VibroAxe]

I wonder what comcast/steam are doing to intercept the request, and if there's anyway we could leverage this

[JasonRivers]

Well, As far as I'm aware, Comcast do some very nasty things with intercepting data (though not as bad as Verizon), What I do know is that they have an agreement with Valve.

The more interesting bit is that Steam itself is requesting that domain, so steam knows it's on a Comcast network. This makes me wonder if Steam sends a message at startup or periodically saying "I'm here, what servers should I download from", if that's a remote request then either Comcast can intercept that and give it's own server, or, Valve respond giving the Comcast domain because they know it's on the Comcast network.

If we were able to intercept this in the same way, that would greatly reduce the DNS complexity for the caching server, I noticed that the Blizzard file has the same, too. Perhaps this might be a good addition to the RFC?

[sirsquidness]

Hi, I wrote this post a while back about how steam discovers servers. Intercepting it adds a lot more complexity, I do not recommend this approach, having used it quite a lot. As part of this serverlist request, valve will be considering not just the region you request but also the ISP you are connecting from. Instead you could generate the server list dynamically, as the server list is not authenticated. http://opensourcelan.com/blog/2016/07/01/steam-cdn/

…

On 16 August 2018 1:27:15 am AEST, Jason Rivers ***@***.***> wrote: Well, As far as I'm aware, Comcast do some very nasty things with intercepting data (though not as bad as Verizon), What I do know is that they have an agreement with Valve. The more interesting bit is that Steam itself is requesting that domain, so steam knows it's on a Comcast network. This makes me wonder if Steam sends a message at startup or periodically saying "I'm here, what servers should I download from", if that's a remote request then either Comcast can intercept that and give it's own server, or, Valve respond giving the Comcast domain because they know it's on the Comcast network. If we were able to intercept this in the same way, that would greatly reduce the DNS complexity for the caching server, I noticed that the Blizzard file has the same, too. Perhaps this might be a good addition to the RFC? -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: #19 (comment)