我有一台运行 Debian 8 Jessie 的服务器，它经常无缘无故地失去互联网访问权限。服务器有两个有线连接，互联网访问位于 eth0 上，内部网络位于 eth1 上。内部连接工作正常。
/etc/network/interfaces 的内容是：
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
allow-hotplug eth0
iface eth0 inet static
address 132.248.25.125
netmask 255.255.255.0
network 132.248.25.0
broadcast 132.248.25.255
gateway 132.248.25.254
dns-nameservers 132.248.204.1 132.248.10.2
allow-hotplug eth1
iface eth1 inet static
address 192.169.1.249
netmask 255.255.255.0
network 192.169.1.0
broadcast 192.169.1.255
gateway 192.169.1.10
如果配置：
eth0 Link encap:Ethernet HWaddr 00:30:48:fe:a7:3c
inet addr:132.248.25.125 Bcast:132.248.25.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fefe:a73c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4278205 errors:0 dropped:8744 overruns:0 frame:0
TX packets:7134 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:371528685 (354.3 MiB) TX bytes:832677 (813.1 KiB)
Memory:f0000000-f001ffff
eth1 Link encap:Ethernet HWaddr 00:30:48:fe:a7:3d
inet addr:192.169.1.249 Bcast:192.169.1.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fefe:a73d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1206214 errors:0 dropped:2667 overruns:0 frame:0
TX packets:3028234 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:75759114 (72.2 MiB) TX bytes:4139225848 (3.8 GiB)
Memory:f0060000-f007ffff
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:65536 Metric:1
RX packets:4644 errors:0 dropped:0 overruns:0 frame:0
TX packets:4644 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1006417 (982.8 KiB) TX bytes:1006417 (982.8 KiB)
对于路线 -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.169.1.10 0.0.0.0 UG 0 0 0 eth1
132.248.25.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.169.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
我对 Linux 很陌生，所以我不太确定我在寻找什么。我的猜测是默认网关出现问题，或者防火墙引起了问题。
任何建议/帮助将不胜感激。
结果ip a:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:30:48:fe:a7:3c brd ff:ff:ff:ff:ff:ff
inet 132.248.25.125/24 brd 132.248.25.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::230:48ff:fefe:a73c/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:30:48:fe:a7:3d brd ff:ff:ff:ff:ff:ff
inet6 fe80::230:48ff:fefe:a73d/64 scope link
valid_lft forever preferred_lft forever
而对于ip r:
132.248.25.0/24 dev eth0 proto kernel scope link src 132.248.25.125
答案1
注释掉一个网关。没有互联网连接的：
#gateway 192.169.1.10
标准配置只能有一个，并且您的路由显示它是当前使用的内部网关。
如果此网关后面还有其他网络，请添加以下内容：
post-up /sbin/ip route add 192.169.X.0/24 via 192.169.1.10
post-down /sbin/ip route del 192.169.X.0/24 via 192.169.1.10
对于内部网关后面的每个网络。