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I have 3 computers, 2 of which are connected to the third. The two NICs in the one machine cannot both work at the same time:
With eth0 up and ...
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- 05-30-2005 #1Linux Guru
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Can't get 2 NICs working in one box
I have 3 computers, 2 of which are connected to the third. The two NICs in the one machine cannot both work at the same time:
With eth0 up and eth1 down, machine connected to eth0 can ping.
With eth1 up and eth0 down, machine connected to eth1 can ping.
With ether NIC up, if second NIC is activated, the second NIC can be pinged but the first cannot. If the first NIC is deactivated and then reactivated, it will be pingable but the other no longer will be.
Both NICs are at interrupt 18 according to /proc/interrupts. I've set these to different interrupts (maybe incorrectly) but Fedora wants to make them the same. eth0 is on the motherboard. I have also tried an e100 NIC for eth1 but it seems to be the same result.Code:# cat /etc/sysconfig/networking/devices/ifcfg-eth0 ONBOOT=yes USERCTL=no PEERDNS=yes GATEWAY=192.168.128.4 TYPE=Ethernet IPADDR=192.168.128.4 DEVICE=eth0 HWADDR=00:90:27:31:8b:67 BOOTPROTO=none NETMASK=255.255.255.0 # cat /etc/sysconfig/networking/devices/ifcfg-eth1 ONBOOT=yes USERCTL=no PEERDNS=yes GATEWAY=192.168.128.4 TYPE=Ethernet IPADDR=192.168.128.5 DEVICE=eth1 HWADDR=00:50:04:22:f6:9d BOOTPROTO=none NETMASK=255.255.255.0 # cat /etc/modules.conf alias eth0 e100 alias eth1 3c59x
Please advise what needs to be changed to get both NICs pingable at the same time. This is Fedora Core 1. I have had a similar or same problem with Slackware./IMHO
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- 06-01-2005 #2Linux Guru
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Plug-N-Play BIOS is set to "No"....
/IMHO
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- 06-01-2005 #3Linux Guru
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What's the output of 'route' at any given point during your NIC debacle?
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- 06-02-2005 #4Linux Guru
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Originally Posted by sarumont I checked this with all combinations of before-after. "both up" applies to (eth0 working / eth1 not) and vice-versa.Code:both down Destination Gateway Genmask Flags Metric Ref Use Iface 127.0.0.0 * 255.0.0.0 U 0 0 0 lo eth0 only Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.128.0 * 255.255.255.0 U 0 0 0 eth0 127.0.0.0 * 255.0.0.0 U 0 0 0 lo eth1 only Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.128.0 * 255.255.255.0 U 0 0 0 eth1 127.0.0.0 * 255.0.0.0 U 0 0 0 lo both up Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.128.0 * 255.255.255.0 U 0 0 0 eth0 192.168.128.0 * 255.255.255.0 U 0 0 0 eth1 127.0.0.0 * 255.0.0.0 U 0 0 0 lo
I don't know if I was mistaken when I wrote that, or if something has changed: now, when the second NIC is activated, the first will continue being pinged, but the second will not work unless and until the first is deactivated. Originally Posted by previously, I /IMHO
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- 06-08-2005 #5Linux Newbie
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Does it help if they're on different subnets? e.g. if eth0 is on 192.168.128.0 and eth1 is on 192.168.129.0?
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- 06-08-2005 #6Linux Guru
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Just curious, can you show the output of
while you have both NICs up?Code:ifconfig
- 06-12-2005 #7Linux Guru
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Originally Posted by anomie Code:eth0 Link encap:Ethernet HWaddr 00:90:27:31:8B:67 inet addr:192.168.128.4 Bcast:192.168.128.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:3 dropped:0 overruns:0 carrier:3 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:126 (126.0 b) Interrupt:18 Base address:0x1480 Memory:f4102000-f4102038 eth1 Link encap:Ethernet HWaddr 00:50:04:22:F6:9D inet addr:192.168.128.5 Bcast:192.168.128.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:4 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:240 (240.0 b) Interrupt:18 Base address:0x1400 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:587 errors:0 dropped:0 overruns:0 frame:0 TX packets:587 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:173142 (169.0 Kb) TX bytes:173142 (169.0 Kb) ppp0 Link encap:Point-to-Point Protocol inet addr:66.2.44.240 P-t-P:67.95.10.135 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:399 errors:0 dropped:0 overruns:0 frame:0 TX packets:411 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:338169 (330.2 Kb) TX bytes:69413 (67.7 Kb)I really don't think it will: do you have reason to think it might? Originally Posted by sxeraverx /IMHO
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- 06-12-2005 #8Linux Enthusiast
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Yes it probably will help. Routing could be confused because there are 2 routes to the same local subnet. I think a different network will resolve this. I'm not sure but it is the first thing I would try.
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- 06-14-2005 #9Linux Guru
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puntsmuts and sxeraverx, let me know what you'd like in the sig space below. Thanks very much.Code:# ifconfig eth0 Link encap:Ethernet HWaddr 00:90:27:31:8B:67 inet addr:192.168.128.4 Bcast:192.168.128.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2275 errors:0 dropped:0 overruns:0 frame:0 TX packets:2978 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:275038 (268.5 Kb) TX bytes:229648 (224.2 Kb) Interrupt:18 Base address:0x1480 Memory:f4102000-f4102038 eth1 Link encap:Ethernet HWaddr 00:50:04:22:F6:9D inet addr:192.168.0.5 Bcast:192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1099 errors:0 dropped:0 overruns:0 frame:0 TX packets:853 errors:0 dropped:0 overruns:0 carrier:3 collisions:0 txqueuelen:1000 RX bytes:106904 (104.3 Kb) TX bytes:82378 (80.4 Kb) Interrupt:18 Base address:0x1400 # route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xxxxxxxxxxxxxxx * 255.255.255.255 UH 0 0 0 ppp0 192.168.128.0 * 255.255.255.0 U 0 0 0 eth0 192.168.128.0 * 255.255.255.0 U 0 0 0 eth0 192.168.0.0 * 255.255.255.0 U 0 0 0 eth1 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 127.0.0.0 * 255.0.0.0 U 0 0 0 lo default xxxxxxxxxxxxxxx 0.0.0.0 UG 0 0 0 ppp0/IMHO
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