Re: simple ping; pinging 101

From: Lai Zit Seng (lzs_at_pobox.com)
Date: 07/06/05

  • Next message: THUFIR HAWAT: "Re: simple ping; pinging 101" 
    Date: Wed, 06 Jul 2005 20:01:23 +0800
To: THUFIR HAWAT <hawat.thufir@gmail.com>, For users of Fedora Core releases <fedora-list@redhat.com>

    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@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
> 
-- 
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