Mikkel L. Ellertson wrote: >> Under Windows XP Run=>cmd I get >> >> ping www.google.com -f -l 1490 >> ... >> Packet needs to be fragmented but DF set >> <repeated several times> ... >> Is there a similar option for ping under Fedora? >> > You may want to take a look at the ping man page: > > The -f and I believe the -s options. I did "man ping". On my system (standard Fedora-10) "ping -s <n> www.google.com" gives rather strange results (as repeated below). If n >= 1470 then ping does not return. If n = 1464 it returns as usual. If n = 1466 or 1468 then I am told the packets are fragmented, [I did not try these numbers before.] Adding the -f flag (as root) does not seem to give any more information. -------------------------------------------------- [tim@mary tmp]$ ping -s 1464 www.google.com PING www.l.google.com (74.125.39.147) 1464(1492) bytes of data. 64 bytes from fx-in-f147.google.com (74.125.39.147): icmp_seq=1 ttl=242 (truncated) 64 bytes from fx-in-f147.google.com (74.125.39.147): icmp_seq=2 ttl=242 (truncated) ^C ... [tim@mary tmp]$ ping -s 1466 www.google.com PING www.l.google.com (74.125.39.99) 1466(1494) bytes of data. >From homegate.homenet.telecomitalia.it (192.168.1.1) icmp_seq=1 Frag needed and DF set (mtu = 1492) ^C ... [tim@mary tmp]$ ping -s 1468 www.google.com PING www.l.google.com (74.125.39.147) 1468(1496) bytes of data. >From homegate.homenet.telecomitalia.it (192.168.1.1) icmp_seq=1 Frag needed and DF set (mtu = 1492) ^C ... [tim@mary tmp]$ ping -s 1470 www.google.com PING www.l.google.com (74.125.39.99) 1470(1498) bytes of data. ^C -------------------------------------------------- It seems from my experiment that one can get the information with ping, but only in a rather bizarre way. > You can add "MTU=1492" to /etc/sysconfig/network-scripts/ifcfg-eth1. I did try this on one (very old) laptop but it did not seem to improve matters. I'll try it again now, and re-boot (not sure if I did that before). -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
