On 01/04/2015 07:21 PM, David Collier-Brown wrote: > From a different rogers subnet, I get a default of 56, successes with > 1500-byte pings to the router and to the outside world, but failures > internally talking to rogers DNS servers
I assume you meant 576, not 56. Do you see an IPv6 link local address on that interface? It starts with fe80. > > First, the dns server: > $ cat /etc/resolv.conf > # Generated by NetworkManager > nameserver 64.71.255.204 > nameserver 64.71.255.198 > > $ ping -s 1500 64.71.255.204 > PING 64.71.255.204 (64.71.255.204) 1500(1528) bytes of data. > ^C > --- 64.71.255.204 ping statistics --- > 19 packets transmitted, 0 received, 100% packet loss, time 17999ms > > > $ ping 64.71.255.204 > PING 64.71.255.204 (64.71.255.204) 56(84) bytes of data. > 64 bytes from 64.71.255.204: icmp_seq=1 ttl=58 time=7.63 ms > 64 bytes from 64.71.255.204: icmp_seq=2 ttl=58 time=7.35 ms > ^C > --- 64.71.255.204 ping statistics --- > 2 packets transmitted, 2 received, 0% packet loss, time 1002ms > rtt min/avg/max/mdev = 7.350/7.492/7.635/0.166 ms > > > Second, ACM.org > $ ping -s 1500 acm.org > PING acm.org (64.238.147.76) 1500(1528) bytes of data. > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=1 ttl=49 > time=42.5 ms > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=2 ttl=49 > time=44.1 ms > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=3 ttl=49 > time=44.5 ms > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=4 ttl=49 > time=44.2 ms > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=5 ttl=49 > time=52.9 ms > 1508 bytes from ACMWEB16.acm.org (64.238.147.76): icmp_seq=6 ttl=49 > time=44.1 ms > ^C > --- acm.org ping statistics --- > 6 packets transmitted, 6 received, 0% packet loss, time 5007ms > rtt min/avg/max/mdev = 42.576/45.430/52.995/3.445 ms This is similar to what I'm seeing. When I ping your DNS, I can do so with 1472, but not 1473 byte packets. I also see that 1472 limit from my notebook, but not my desktop, when going out to the Internet. I do not see it when pinging from my notebook to a computer on my local LAN. When pinging www.yahoo.com from my desktop system, I can ping with 1500 bytes. I'm not sure why 2 computers on my network get different results to Yahoo. Or where that 1472 limit is coming from. --- GTALUG Talk Mailing List - [email protected] http://gtalug.org/mailman/listinfo/talk
