two computers, arrakis and caladan, are connected with some standard RJ45 Cat 5e cable and a hub. arrakis can ping caladan from eth0. arrakis cannot ping caladan from eth1. what's wrong with arrakis eth1, please? I'm 99.999% sure it's not a hardware problem. eth0 is built-in to the motherboard, eth1 is a D-Link NIC. arrakis eth0 192.168.0.100 arrakis eth1 192.168.0.101 caladan eth0 192.168.0.102 terminal stuff from arrakis: [root@arrakis init.d]# echo "arrakis eth0 pinging caladan eth0" arrakis eth0 pinging caladan eth0 [root@arrakis init.d]# ./network restart Shutting down interface eth0: [ OK ] Shutting down interface eth1: [ OK ] Shutting down loopback interface: [ OK ] Disabling IPv4 packet forwarding: [ OK ] Setting network parameters: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: [ OK ] Bringing up interface eth1: [ OK ] [root@arrakis init.d]# ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102) 56(84) bytes of data. 64 bytes from 192.168.0.102: icmp_seq=0 ttl=128 time=1.33 ms 64 bytes from 192.168.0.102: icmp_seq=1 ttl=128 time=0.465 ms 64 bytes from 192.168.0.102: icmp_seq=2 ttl=128 time=0.464 ms 64 bytes from 192.168.0.102: icmp_seq=3 ttl=128 time=0.472 ms 64 bytes from 192.168.0.102: icmp_seq=4 ttl=128 time=0.466 ms --- 192.168.0.102 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4028ms rtt min/avg/max/mdev = 0.464/0.641/1.339/0.349 ms, pipe 2 [root@arrakis init.d]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # built-in DEVICE=eth0 ONBOOT=yes BOOTPROTO=none HOSTNAME=arrakis #HWADDR=00:0D:88:37:FA:22 NETMASK=255.255.255.0 IPADDR=192.168.0.100 USERCTL=yes PEERDNS=yes TYPE=Ethernet IPV6INIT=yes [root@arrakis init.d]# cat /etc/sysconfig/network-scripts/ifcfg-eth1 # D-Link System Inc RTL8139 Ethernet DEVICE=eth1 ONBOOT=yes BOOTPROTO=none HOSTNAME=arrakis HWADDR=00:0D:88:37:FA:22 NETMASK=255.255.255.0 IPADDR=192.168.0.101 USERCTL=yes PEERDNS=yes TYPE=Ethernet IPV6INIT=yes [root@arrakis init.d]# ifconfig eth0 Link encap:Ethernet HWaddr 00:0A:E6:A0:24:27 inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20a:e6ff:fea0:2427/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:123 errors:6 dropped:0 overruns:0 frame:6 TX packets:62 errors:0 dropped:0 overruns:0 carrier:0 collisions:21 txqueuelen:1000 RX bytes:15378 (15.0 KiB) TX bytes:4144 (4.0 KiB) Interrupt:5 Base address:0xd400 eth1 Link encap:Ethernet HWaddr 00:0D:88:37:FA:22 inet addr:192.168.0.101 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20d:88ff:fe37:fa22/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:45 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:3090 (3.0 KiB) Interrupt:5 Base address:0xd000 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:108 errors:0 dropped:0 overruns:0 frame:0 TX packets:108 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:8528 (8.3 KiB) TX bytes:8528 (8.3 KiB) [root@arrakis init.d]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 * 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 eth1 [root@arrakis init.d]# [root@arrakis init.d]# echo "arrakis eth1 pinging caladan eth0" arrakis eth1 pinging caladan eth0 [root@arrakis init.d]# ./network restart Shutting down interface eth0: [ OK ] Shutting down interface eth1: [ OK ] Shutting down loopback interface: [ OK ] Disabling IPv4 packet forwarding: [ OK ] Setting network parameters: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: [ OK ] Bringing up interface eth1: [ OK ] [root@arrakis init.d]# ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102) 56(84) bytes of data. >From 192.168.0.100 icmp_seq=1 Destination Host Unreachable >From 192.168.0.100 icmp_seq=2 Destination Host Unreachable >From 192.168.0.100 icmp_seq=3 Destination Host Unreachable >From 192.168.0.100 icmp_seq=5 Destination Host Unreachable >From 192.168.0.100 icmp_seq=6 Destination Host Unreachable >From 192.168.0.100 icmp_seq=7 Destination Host Unreachable --- 192.168.0.102 ping statistics --- 8 packets transmitted, 0 received, +6 errors, 100% packet loss, time 6999ms , pipe 4 [root@arrakis init.d]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # built-in DEVICE=eth0 ONBOOT=yes BOOTPROTO=none HOSTNAME=arrakis #HWADDR=00:0D:88:37:FA:22 NETMASK=255.255.255.0 IPADDR=192.168.0.100 USERCTL=yes PEERDNS=yes TYPE=Ethernet IPV6INIT=yes [root@arrakis init.d]# cat /etc/sysconfig/network-scripts/ifcfg-eth1 # D-Link System Inc RTL8139 Ethernet DEVICE=eth1 ONBOOT=yes BOOTPROTO=none HOSTNAME=arrakis HWADDR=00:0D:88:37:FA:22 NETMASK=255.255.255.0 IPADDR=192.168.0.101 USERCTL=yes PEERDNS=yes TYPE=Ethernet IPV6INIT=yes [root@arrakis init.d]# ifconfig eth0 Link encap:Ethernet HWaddr 00:0A:E6:A0:24:27 inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20a:e6ff:fea0:2427/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:123 errors:6 dropped:0 overruns:0 frame:6 TX packets:76 errors:0 dropped:0 overruns:0 carrier:0 collisions:21 txqueuelen:1000 RX bytes:15378 (15.0 KiB) TX bytes:4900 (4.7 KiB) Interrupt:5 Base address:0xd400 eth1 Link encap:Ethernet HWaddr 00:0D:88:37:FA:22 inet addr:192.168.0.101 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20d:88ff:fe37:fa22/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:54 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:3708 (3.6 KiB) Interrupt:5 Base address:0xd000 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:114 errors:0 dropped:0 overruns:0 frame:0 TX packets:114 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:9200 (8.9 KiB) TX bytes:9200 (8.9 KiB) [root@arrakis init.d]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 * 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 eth1 [root@arrakis init.d]# links: arrakis mother board: <http://www.ecsusa.com/downloads/manual_k7s.html> eth1 NIC on arrakis: <http://www.dlink.ca/product.php?PID=124> thanks, Thufir