On Mon, 2003-11-17 at 13:58, Dawson, Alan wrote: > Hi all, > > > I have a linux box acting as a router on a 10 mbit line, > the other end is a Cisco 2621 with dual fast ethernet ports. > > I'm not getting the performance from the line I would hope, > and I'm attempting to track the problems. > > The PC is a 400Mhz Pentium II with 2 ethernet cards simply routing > and a small amount of Packet filetering. (dropping icmp-type 8) > which is I think pings (this is to filter MS Welchia worm scanning traffic) > > Using mrtg to measure bandwidth usage I don't seem to be able to get more > than 2Mbit from the line. > This is similar to the numbers I get from copying files using windows > robocopy > > Doing a ifconfig on the lan side > > clownerouter:~ # ifconfig eth0 > eth0 Link encap:Ethernet HWaddr 00:04:75:D2:4C:2E > inet addr:172.25.1.250 Bcast:172.25.255.255 Mask:255.255.0.0 > inet6 addr: fe80::204:75ff:fed2:4c2e/10 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:8512868 errors:0 dropped:0 overruns:1 frame:0 > TX packets:6239407 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:100 > RX bytes:4022267518 (3835.9 Mb) TX bytes:2136425933 (2037.4 Mb) > Interrupt:12 Base address:0x1400 > > which looks OK > > but on the wan side > > clownerouter:~ # ifconfig eth1 > eth1 Link encap:Ethernet HWaddr 00:C0:CA:15:61:BF > inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0 > inet6 addr: fe80::2c0:caff:fe15:61bf/10 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:6173121 errors:0 dropped:0 overruns:0 frame:0 > TX packets:5774684 errors:362353 dropped:0 overruns:0 > carrier:724706 > ^^^^^^^^^^^^ > collisions:372551 txqueuelen:100 > RX bytes:2129446956 (2030.7 Mb) TX bytes:3315793152 (3162.1 Mb) > Interrupt:10 Base address:0x4400 > > I get a lot of errors. > > Is this BAD. should I replace the NIC, or is it the WAN line itself. or > could it be the 2621? > Do you have access to the Cisco router, howabout a show int fastethernet 0/0 (or 0/1) on the cisco router; does it show the errors. What are the duplex/speed settings of the Cisco router? Try forcing from 10Mb half duplex both ends (or on the Linux box if that is all you control) and see if the erros stop. Make sure you aren't confusing 2Mbytes against 10 Mbits; and not expecting more than the WAN link can support (think about encapsulation and fragmentation). That's the first instant thoughts after a long day at work. Adam
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