Thanks again for your help with this. I've run 500 pings (-c 500 -i 0) in both directions, and got zero loss. Ill try running tcpdump on both servers, and re-testing to check the segments. Swapping the servers would be extremely difficult ;) (They are over 1000k's apart, and one is in an unmanned(majority of the time) data centre.
> From: mtzgu...@gmail.com > Date: Fri, 12 Apr 2013 01:38:40 -0300 > Subject: Re: iperf / ftp / http TCP poor performance in one direction (UDP > good) > To: johnellio...@hotmail.com > CC: debian-user@lists.debian.org > > On Fri, Apr 12, 2013 at 1:16 AM, Guido Martínez <mtzgu...@gmail.com> wrote: > > Did you check if A acknowledges every received segment? > Sorry, what I meant by this is if every sent segment from B reaches A. > You can run an instance of wireshark on each host to check this. > Basically you need to check for packet loss at high speeds (ping could > be of use if you set the interval to 0). > > TCP Dup ACKs are likely caused by packet loss. > TCP segment of a reassembled PDU is something Wireshark adds since it > interprets a bit about application layer protocols, and I think it's > not a reason to worry (I could have understood this wrong, I just > looked it up). > > If it's easy, you could also try swapping the location of the hosts, > to see if the problem is on the hosts, or on the link. > > Hope it helps and post more info if you find any. > Guido > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org > Archive: > http://lists.debian.org/CA++DQUnEPW=oEAHY02MPSXihm-FpoAC3ddYOA0+m=vk...@mail.gmail.com >
