On 31 May 2016, at 18:22, Dimitris Diochnos <diochnos@xxxxxxxxx> wrote: > I can understand that some element along the path from B to A is > silently dropping packets larger than 1458. However, the other point > that I am making is that when MTU is set to the default 1500 (as > reported by ifconfig) then, the command > > ssh -p PPPP user@host > > fails (selecting automatically for mac umac-64-etm@xxxxxxxxxxx), while > the command > > ssh -m umac-64-etm@xxxxxxxxxxx -p PPPP user@host > > succeeds. MTU / MSS problems are notorious for being tickled only by specific data sizes. Your first example happens to use different size packets from the second, causing the TCP window to be within the problematic range. A bit smaller or a bit larger packets will work. Debug the network problem and all will be fine. http://netalyzr.icsi.berkeley.edu/ specifically this test http://netalyzr.icsi.berkeley.edu/info_mtu.html is quite useful though only tests between the browser and the site it runs on. Other tools are also available. -- Alex Bligh _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
