OK Ross I think I understand now. I did not realise before that the ifconfig you posted was from the Netcomm box. I thought it was from the Mandrake mail server. It is the mail server on which I was suggesting reducing the MTU.
In any case I think I know what the problem is, and why you are getting so many collisions on the Ethernet. I think you have an auto-negotiation problem on the Ethernet between the Netcomm box, and the Mandrake box. One or both of them have configured themselves for full duplex operation, but the cable/hub you are using is only capable of half duplex. So whenever a data packet collides with an acknowledgment you get a retransmission and the whole thing slows to a crawl. The solution is to either replace your Ethernet hub with a full duplex switch (the unbranded ones are real cheap now), or else to force your Ethernet interfaces to half duplex. There should be a utility on your Mandrake system, (and hopefully the Netcomm aslso) called mii-tool Just type mii-tool and you will see the status of your Ethernets [root@Derek derek]# mii-tool eth0: negotiated 100baseTx-FD flow-control, link ok mii-tool -F 100baseTx-HD eth0 will for example force 100M Ethernet Half duplex. See man mii-tool for details. Also do not forget to set your Windows boxes to Half duplex also :) HTH derek On Sunday 02 Feb 2003 2:19 am, Ross Slade wrote: > ----------------------------------------------------------- > eth0 Link encap:Ethernet HWaddr 00:60:64:02:32:12 > inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:552 Metric:1 > RX packets:513 errors:0 dropped:880 overruns:0 frame:205 > TX packets:469 errors:0 dropped:0 overruns:0 carrier:0 > collisions:1 > Interrupt:3 Base address:0x300 > > lo Link encap:Local Loopback > inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0 > UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 > > ppp0 Link encap:Point-to-Point Protocol > inet addr:203.14.156.30 P-t-P:203.14.156.2 Mask:255.255.255.0 > UP POINTOPOINT RUNNING MTU:552 Metric:1 > RX packets:380 errors:0 dropped:0 overruns:0 frame:0 > TX packets:390 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 > Memory:325036-32549a > ----------------------------------------------------------- > > > > > ----- Original Message ----- > From: Derek Jennings <[EMAIL PROTECTED]> > > > I do not understand why you have a ppp0 and sl0 interface up? Do you have > > a > > > dial up connection, or some other interface active? Or is this how pppoe > > is > > > configured? The ppp0 interface seems to be in use. Could it be this is > > the > > > one you need to reduce the MTU on? > > > > You could also try a figure less than 1480 (I got that off a Windows XP > > help > > > site) > > I don't know, it's just however Netcomm set it up...ppp0 is my internet > connection (31.6k) > > Above is what ifconfig reports now - an mtu of 576 seems common, but > doesn't help with my problem. Any idea of a possible cause of the dropped > RX packets and "collisions"? > > thanks, Ross > > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.445 / Virus Database: 250 - Release Date: 21/01/2003 -- ---------------------------------- www.jennings.homelinux.net
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