nanog mailing list archives
Re: Strange TCP connection behavior 2.0 RC2 (+3)
From: Cameron Byrne <cb.list6 () gmail com>
Date: Wed, 29 Jun 2011 07:34:26 -0700
On Jun 29, 2011 6:00 AM, "Ryan Malayter" <malayter () gmail com> wrote:
On Jun 28, 3:35 pm, Cameron Byrne <cb.li... () gmail com> wrote:AFAIK, Verizon and all the other 4 largest mobile networks in the USA have transparent TCP proxies in place.Do you have a reference for that information? Neither AT&T nor Sprint
No.
seem to have transparent *HTTP* proxies according to http://www.lagado.com/tools/cache-test. I would have thought that would be the first and most important optimization a mobile carrier could make. I used to see "mobile-optimized" images and HTTP compression for sites that weren't using it at the origin on Verizon's 3G network a few years ago, so Verizon clearly had some form of HTTP proxy in effect. Aside from that, how would one check for a transparent *TCP* proxy? By looking at IP or TCP option fingerprints at the receiver? Or comparing TCP ACK RTT versus ICMP ping RTT?
I am not familiar with that HTTP proxy test. As I said, they are likely using tcp proxies to get over tcp issues. I assume if you were sniffing both ends you could discover changes in parameters forced by the middle box. Cb
Current thread:
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3), (continued)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Mikael Abrahamsson (Jun 28)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Tony Finch (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Nick Hilliard (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Mikael Abrahamsson (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Cameron Byrne (Jun 29)
- RE: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Leigh Porter (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Mikael Abrahamsson (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Cameron Byrne (Jun 29)
- Re: Strange TCP connection behavior 2.0 RC2 (+3) Ryan Malayter (Jun 29)
- Re: Strange TCP connection behavior 2.0 RC2 (+3) Steven Bellovin (Jun 29)
- Re: Strange TCP connection behavior 2.0 RC2 (+3) Cameron Byrne (Jun 29)
- Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3) Hank Nussbacher (Jun 29)