Messages in this thread |  | | Date | Sun, 14 Jan 2001 12:03:56 -0500 | From | John Cavan <> | Subject | Networking strangeness 2.4.0-ac9 and earlier |
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Hi all,
I've seen this for a while... the output from netstat and ifconfig do not agree on the MTU of the device:
[root@lion /root]# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.1.11.0 * 255.255.255.0 U 40 0 0 eth0 127.0.0.0 * 255.0.0.0 U 40 0 0 lo default spqr 0.0.0.0 UG 40 0 0 eth0
[root@lion /root]# ifconfig eth0 Link encap:Ethernet HWaddr 00:10:4B:2B:12:80 inet addr:10.1.11.76 Bcast:10.1.11.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3648 errors:77 dropped:0 overruns:0 frame:144 TX packets:3863 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 Interrupt:11 Base address:0xd800
lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16192 Metric:1 RX packets:139 errors:0 dropped:0 overruns:0 frame:0 TX packets:139 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0
AFAIK, the MSS value should be about 40 less than the MTU, not 40, though on other Linux boxes I have, the MSS column from netstat shows 0 (both of them are 2.2 kernels and single proc machines). This machine is a dual P3-500 with 512mb of RAM and a 3COM 3c905 card. I understand that the MSS column should actually read the MTU, but I don't know if that is the case. Either way cat /proc/net/route shows:
Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT eth0 000B010A 00000000 0001 0 0 0 00FFFFFF 40 0 0 lo 0000007F 00000000 0001 0 0 0 000000FF 40 0 0 eth0 00000000 FE0B010A 0003 0 0 0 00000000 40 0 0
One of the things that seem to be symptomatic of the problem is web browsing to my Ultra 5 (Solaris 2.6 with recommended patches). A single web page can take several minutes to load with all images on my local LAN, but on the other Linux machines, it blows in before you can blink (as would be expected). Similar behaviour can be seen browsing against other Linux machines as well, though not as bad. Other network protocols are slower as well (FTP, telnet), though not once it gets through the firewall, oddly enough.
Any help appreciated.
Thanks, John - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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