simple ping; pinging 101
Lai Zit Seng
lzs at pobox.com
Wed Jul 6 12:01:23 UTC 2005
How are you selecting to ping via eth0 or eth1? It seems to be that in
both cases your ping would have chosen eth0. Yet the 2nd case fails.
Are you selectively pulling out physically the network cable to "select"
the network interface to use? This is not going to work!
Regards,
.lzs
--
http://zitseng.com/
THUFIR HAWAT wrote:
> 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 at arrakis init.d]# echo "arrakis eth0 pinging caladan eth0"
> arrakis eth0 pinging caladan eth0
> [root at 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 at 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 at 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 at 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 at 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 at 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 at arrakis init.d]#
>
> [root at arrakis init.d]# echo "arrakis eth1 pinging caladan eth0"
> arrakis eth1 pinging caladan eth0
> [root at 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 at 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 at 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 at 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 at 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 at 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 at 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
>
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