All, I have started a new thread for this part of my problem, the bridging part having been solved - thanks, Paul ! To restate: eth0 - NC100 Network Everywhere Fast Ethernet 10/100 - PCI Card Manf: Linksys, Driver tulip eth1 - NC100 Network Everywhere Fast Ethernet 10/100 - PCI Card Manf: Linksys, Driver tulip eth2 - NC100 Network Everywhere Fast Ethernet 10/100 - PCI Card Manf: Linksys, Driver tulip eth3 - 3c940 10/100/1000Base-T [Marvell] - Motherboard Manf: 3Com, Driver sk98lin All appear in the Hardware Browser; all appear in the Network Configuration tool. Giving all the cards unique IPs, and activating them, ifconfig reports: eth0 Link encap:Ethernet HWaddr 00:50:22:20:2F:67 inet addr:192.168.1.64 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:22ff:fe20:2f67/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:24044 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:208 dropped:0 overruns:0 carrier:413 collisions:0 txqueuelen:1000 RX bytes:19426437 (18.5 Mb) TX bytes:0 (0.0 b) Interrupt:11 Base address:0x8c00 eth1 Link encap:Ethernet HWaddr 00:50:22:20:22:03 inet addr:192.168.1.74 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:22ff:fe20:2203/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:27 dropped:0 overruns:0 carrier:54 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:10 Base address:0xa000 eth2 Link encap:Ethernet HWaddr 00:50:22:28:04:59 inet addr:192.168.1.84 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:22ff:fe28:459/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:27 dropped:0 overruns:0 carrier:54 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:5 Base address:0xfc00 eth3 Link encap:Ethernet HWaddr 00:0E:A6:1A:B3:99 inet addr:192.168.1.94 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20e:a6ff:fe1a:b399/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:22898 errors:0 dropped:0 overruns:0 frame:0 TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:18526297 (17.6 Mb) TX bytes:624 (624.0 b) Interrupt:5 Memory:feafc000-0 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:2001 errors:0 dropped:0 overruns:0 frame:0 TX packets:2001 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1982257 (1.8 Mb) TX bytes:1982257 (1.8 Mb) /etc/modprobe.conf contains: alias tulip eth0 alias tulip eth1 alias tulip eth2 alias sk98lin eth3 Doing a 'service network restart' says: Shutting down interface eth0: [ OK ] Shutting down interface eth1: [ OK ] Shutting down interface eth2: [ OK ] Shutting down interface eth3: [ OK ] Shutting down loopback interface: [ OK ] Setting network parameters: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: [ OK ] Bringing up interface eth3: [ OK ] and then ifconfig reports: eth0 Link encap:Ethernet HWaddr 00:50:22:20:2F:67 inet addr:192.168.1.64 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:22ff:fe20:2f67/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:24106 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:240 dropped:0 overruns:0 carrier:473 collisions:0 txqueuelen:1000 RX bytes:19433184 (18.5 Mb) TX bytes:0 (0.0 b) Interrupt:11 Base address:0x8c00 eth3 Link encap:Ethernet HWaddr 00:0E:A6:1A:B3:99 inet addr:192.168.1.94 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20e:a6ff:fe1a:b399/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:22938 errors:0 dropped:0 overruns:0 frame:0 TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:18531501 (17.6 Mb) TX bytes:624 (624.0 b) Interrupt:5 Memory:feafc000-0 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:2001 errors:0 dropped:0 overruns:0 frame:0 TX packets:2001 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1982257 (1.8 Mb) TX bytes:1982257 (1.8 Mb) /var/spool/messages for the 'service network restart' said: Oct 26 17:23:33 turner network: Shutting down interface eth0: succeeded Oct 26 17:23:33 turner network: Shutting down interface eth1: succeeded Oct 26 17:23:33 turner network: Shutting down interface eth2: succeeded Oct 26 17:23:33 turner kernel: eth3: network connection down Oct 26 17:23:33 turner network: Shutting down interface eth3: succeeded Oct 26 17:23:33 turner network: Shutting down loopback interface: succeeded Oct 26 17:23:33 turner sysctl: net.ipv4.ip_forward = 0 Oct 26 17:23:33 turner sysctl: net.ipv4.conf.default.rp_filter = 1 Oct 26 17:23:33 turner sysctl: kernel.sysrq = 0 Oct 26 17:23:33 turner sysctl: kernel.core_uses_pid = 1 Oct 26 17:23:33 turner network: Setting network parameters: succeeded Oct 26 17:23:33 turner kernel: ip_tables: (C) 2000-2002 Netfilter core team Oct 26 17:23:33 turner kernel: Disabled Privacy Extensions on device 0235c2a0(lo) Oct 26 17:23:34 turner network: Bringing up loopback interface: succeeded Oct 26 17:23:34 turner kernel: ip_tables: (C) 2000-2002 Netfilter core team Oct 26 17:23:36 turner network: Bringing up interface eth0: succeeded Oct 26 17:23:36 turner kernel: ip_tables: (C) 2000-2002 Netfilter core team Oct 26 17:23:37 turner kernel: eth0: Setting half-duplex based on MII#1 link partner capability of 0021. Oct 26 17:23:38 turner network: Bringing up interface eth3: succeeded Oct 26 17:23:38 turner kernel: eth3: network connection up using port A Oct 26 17:23:38 turner kernel: speed: 10 Oct 26 17:23:38 turner kernel: autonegotiation: yes Oct 26 17:23:38 turner kernel: duplex mode: half Oct 26 17:23:38 turner kernel: flowctrl: none Oct 26 17:23:38 turner kernel: irq moderation: disabled Oct 26 17:23:38 turner kernel: scatter-gather: enabled Any ideas why eth1 and eth2 don't come back up after a 'service network restart' or what I can do to get them into operation ? Jonathan