Hello, this is a correct response:
From 62.156.246.57 (62.156.246.57) icmp_seq=1 Frag needed and DF set (mtu = 1492) So PMTU discovery is working. No problem here. You got correct message to lower the packet size from 62.156.246.57. This is probably the last hop before your site. Marek 2020-06-23 9:40 GMT+02:00, Luca Bertoncello <[email protected]>: > Am 23.06.2020 09:28, schrieb Marek Greško: > > Hi > >> if you need clampmss then it is highly probable there is a PMTU >> discovery problem. The clampmss does not work for UDP. > > Is there a way to check if I have this problem? > >> I probably counted the size incorrectly. So you are able to ping with >> size 1464 and not with 1466. How about trying same ping sizes from the >> internet towards your site? I mean trying to ping from sites with >> higher MTU than yours without lower MTU links in the path. > > lucabert@ns:~$ ping -4 -M do -s 1465 bpi.d.lucabert.com > PING bpi.d.lucabert.com (93.241.91.232) 1465(1493) bytes of data. > From 62.156.246.57 (62.156.246.57) icmp_seq=1 Frag needed and DF set > (mtu = 1492) > ping: local error: Message too long, mtu=1492 > ping: local error: Message too long, mtu=1492 > ping: local error: Message too long, mtu=1492 > ^C > --- bpi.d.lucabert.com ping statistics --- > 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time > 3965ms > pipe 2 > > With paket size of 1464 it works... > >> You know MTU is a size of l2 frame, so using ipv6 you are able to use >> higher payload sizes because of ip header size. > > OK, thanks! > Luca Bertoncello > ([email protected]) > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > Check out the new Asterisk community forum at: > https://community.asterisk.org/ > > New to Asterisk? Start here: > https://wiki.asterisk.org/wiki/display/AST/Getting+Started > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
