我有这个configuration的Ubuntu 10.04服务器：
eth0：192.168.10.XXX掩码255.255.255.0 gw 192.168.10.254
eth1：192.168.0.XXX掩码255.255.255.0 gw 192.168.0.3
eth0用于传入和传出的stream量（内部networking服务器）
eth1我想用于访问networking：192.168.51.0/24网关192.168.0.1
当eth1closures时，Web服务器可以访问。
当我想把eth1的状态改为up时，我使用下面的命令：
$ sudo su # ifconfig eth1 up # route add -net 192.168.51.0 netmask 255.255.255.0 gw 192.168.0.1 # ping 192.168.51.XXX [i've got contact] # ip route add default via 192.168.10.254 # ping 192.168.51.XXX [i've got contact] 但是当我想访问networking服务器，我无法联系。
有人可以请给我一些build议，以便networking.51和networking服务器（networking.10）是可达？
我执行的命令是：
# route del -net 192.168.0.0 netmask 255.255.255.0 eth1
在命令my：0networking之后，可以访问10个networking和51个networking。
我也编辑/etc/sysctl.conf并取消注释net.ipv4.ip_forward=1之前，但我不知道这是否是必要的。
我的configuration：
eth0 Link encap:Ethernet HWaddr 00:0c:29:e0:03:9c inet addr:192.168.10.2 Bcast:192.168.10.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fee0:39c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:53794 errors:0 dropped:0 overruns:0 frame:0 TX packets:53916 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6812117 (6.8 MB) TX bytes:21573511 (21.5 MB) eth0:1 Link encap:Ethernet HWaddr 00:0c:29:e0:03:9c inet addr:192.168.10.10 Bcast:192.168.10.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 eth1 Link encap:Ethernet HWaddr 00:0c:29:e0:03:a6 inet addr:192.168.0.237 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fee0:3a6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:29845 errors:0 dropped:0 overruns:0 frame:0 TX packets:469 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2555869 (2.5 MB) TX bytes:42872 (42.8 KB) 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:8157 errors:0 dropped:0 overruns:0 frame:0 TX packets:8157 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:624350 (624.3 KB) TX bytes:624350 (624.3 KB)
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.51.0 192.168.0.1 255.255.255.0 UG 0 0 0 eth1 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 0.0.0.0 192.168.10.254 0.0.0.0 UG 0 0 0 eth0 0.0.0.0 192.168.10.254 0.0.0.0 UG 100 0 0 eth0 0.0.0.0 192.168.10.254 0.0.0.0 UG 100 0 0 eth0
# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 192.168.10.2 netmask 255.255.255.0 gateway 192.168.10.254 auto eth0:1 iface eth0:1 inet static address 192.168.10.10 netmask 255.255.255.0 gateway 192.168.10.254 auto eth1 iface eth1 inet static address 192.168.0.237 netmask 255.255.255.0 gateway 192.168.0.1 post-up route add -net 192.168.51.0 netmask 255.255.255.0 gw 192.168.0.1