-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Tuesday 07 February 2012 04:45 AM, Martin Pool wrote: > I have helped a few people recently who were having path MTU > discovery problems, causing bulk TCP transfers to hang > quasi-intermittently. Once you know the likely cause it's fairly > easy but it's a fairly annoying problem for someone who doesn't > recognize it. > > There is a kernel sysctl "sudo sysctl -w > net.ipv4.tcp_mtu_probing=1" that seems fairly effective at > detecting when the problem is occurring and automatically fixing > it. This implements RFC 4821. It is off by default in the > kernel. I haven't seen any reports of problems caused by turning > it on, but there may be some. > > I wonder if Ubuntu should turn it on in /etc/sysctl.d?
I have tried using it in the past because of my b0rken wireless router from the ISP which had a different, non-standard, MTU size. For me, the probing did not work at all and I had to manually set the MTU every time I was at my home essid. Will setting it on create trouble? Not sure. This will need testing. - -- Given the large number of mailing lists I follow, I request you to CC me in replies for quicker response -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBCgAGBQJPMjeuAAoJEKY6WKPy4XVprOoP/RyqC+2d3vlOh70C4UcOfUzo XMOiEaQO5ozSA9yw5rSsrBNwztp4rMPIrnE7HmG5DeJwzWHSQnqCsnOxwwLq8uCv ZJn08z08/TzN0TOy0UVGDKGkc4y++c7sKfQHozYzlGZngrRK0VQ84tsyRkXZrBrh gf/1MDuxlcRf504Jxfm9fDXqvdZSFulUqV3WUepvnuRpVfGfsW7Ywd4Wc8ws2Wbv 2mwjQByMKHAcae2FWuAMY87KMDFi95KMFErkXIy2VxBT7lEY6+S0QUeTNpryzBaV Z9VN7Pi8tmLQoVkTMAlRkdz4v21kQAPr76xJY2JTEa6CdD2jKvcc7aBTJH1p5r30 dtTLfwUPMF7ygiaX2LAs5A9T1Ln8VikAJdEBUeUbLndAy5zrKLog31/78nMKXgTN n8kOpM0wKfox4lqyeK9ItEl4zCbZ0vxc9LojJPmu7yR0VcAb3qDBEr+qgJWo7vNC 7tlCRQMht2omZWrEuRd6fJo88Ld6LcoSp3o6XF4GVkCd2rgxFli5a5B7IQMaR82m IaP2corh/8ETVXBO0sWXVvNR3ctPJ2D01HNdBsE7Q9b6WsZtVMK+0ZDMMIxxjNsu DdCQ4iuPc7/D1tSZGzSuuW0pisHEh3P78LUNzEuoadGQPJZlS5Pp8eMZMjlfNyvR jI8DOkcG4B2rbRPwTlUC =GjcM -----END PGP SIGNATURE----- -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss