I have a strange problem on my home lan... My linux box is acting as an IP-Masquerading gateway to my cable-modem connection. I have a couple 100Mbit NICs in my machine, and a 100Mbit NIC in each of the other pcs (a win95 and win98 box). The problem is that transfers FROM my machine to either of the others maxes out at 10Kbps. Transfers TO my machine from either of these achieve speeds that are normal for a 100Mbit network. I have changed the NIC that was serving the lan, and the problem remains. I have an auto-switching hub, and it indicates that all 3 cards are at 100Mbit. Changing all cards to run at 10Mbit makes no difference. Yes, I run vmware, but disabling its networking portions makes no difference. Protocol used for transer makes no difference, other than FTP is particularly slow. I have read every bit of relevant documentation, including what I could find on deja.com and altavista.
Setup: Linux box (Debian potato) 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 24) (eth0, 3c59x) Connected to my cable modem. Works perfectly Lite-On Communications Inc LNE100TX (rev 21) (eth1, tulip) Connected to LAN. This one has problems Routes Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.91.0 * 255.255.255.0 U 0 0 0 eth1 192.168.90.0 * 255.255.255.0 U 0 0 0 vmnet1 24.131.20.0 * 255.255.252.0 U 0 0 0 eth0 default nic-c20-001.mw. 0.0.0.0 UG 0 0 0 eth0 ifconfig for the ethX devices eth0 Link encap:Ethernet HWaddr 00:10:4B:70:B8:B8 inet addr:24.131.21.157 Bcast:24.131.23.255 Mask:255.255.252.0 UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1 RX packets:97705 errors:1193 dropped:0 overruns:0 frame:1785 TX packets:22063 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 Interrupt:17 Base address:0xdc00 eth1 Link encap:Ethernet HWaddr 00:A0:CC:3F:39:A4 inet addr:192.168.91.1 Bcast:192.168.91.255 Mask:255.255.255.0 UP BROADCAST RUNNING MTU:1500 Metric:1 RX packets:23242 errors:1 dropped:0 overruns:0 frame:1 TX packets:24950 errors:0 dropped:0 overruns:0 carrier:0 collisions:2 txqueuelen:100 Interrupt:18 Base address:0xd800 Win95 SOHOWare card, uses a tulip-compatible chip Win98 3Com Corporation 3c905B 100BaseTX [Cyclone] Avi Shevin [EMAIL PROTECTED]