/ etc / network / interfaces中定义的别名接口不能有多个默认网关.不幸的是,我想使用相同的接口访问2个不同的网络,我需要在同一个接口上定义2个地址和2个网关.

此别名接口必须位于eth1接口上,因为eth0用于本地网络.如果我只为主eth1接口定义一个网关,并手动为路由添加默认gw 1.2.3.4为别名eth1：0它可以工作.

但我希望它能在启动时自动正确设置.

这是我的最后一次试用/ etc / network / interfaces：

# The loopback network interface

auto lo

iface lo inet loopback

# The external network interface, address on university internal network

auto eth1

iface eth1 inet static

address 172.x.y.33

netmask 255.255.255.224

network 172.x.y.32

broadcast 172.x.y.63

# dns-* options are implemented by the resolvconf package, if installed

dns-nameservers x.x.x.x

dns-search mysite.org

# multiple gateways are not allowed, so I try to add them like that:

post-up route add default gw 172.x.y.62 metric 1

pre-down route del default gw 172.x.y.62

# external interface with external world IP address

auto eth1:0

iface eth1:0 inet static

address 1.2.3.1

netmask 255.255.255.128

network 1.2.3.0

broadcast 1.2.3.128

# dns on ensg dns

dns-nameservers x.x.x.x

dns-search mysite.org

# multiple gateways are not allowed, so I try to add them like that:

post-up route add default gw x.x.x.x metric 2

pre-down route del default gw x.x.x.x

# internal network for my cluster

auto eth0

iface eth0 inet static

address 10.1.1.1

netmask 255.255.255.0

network 10.1.1.0

broadcast 10.1.1.255

gateway 10.1.1.1

# dns-* options are implemented by the resolvconf package, if installed

dns-nameservers 10.1.1.1 127.0.0.1

dns-search cluster

但是当我尝试调出一个界面时,我会得到：

root@server:~# ifconfig eth1:0 up

SIOCSIFFLAGS: Cannot assign requested address

我自己找不到进一步的解决方案,有没有人有想法？

谢谢,最好的问候.

解：

我终于解决了这个问题：

# The primary network interface

auto eth1

iface eth1 inet static

address a.b.c.1

netmask 255.255.255.128

network a.b.c.0

broadcast a.b.c.128

# this is the interface with the default gateway!

gateway a.b.c.126

dns-nameservers a.d.e.f

dns-search mysite.org

auto eth1:0

iface eth1:0 inet static

address 172.x.y.33

netmask 255.255.255.224

network 172.x.y.32

broadcast 172.x.y.63

# multiple gateways are not allowed, so we do it like that

post-up route add -net 172.x.y.32 netmask 255.255.255.224 gw 172.x.y.62

pre-down route del -net 172.x.y.32 netmask 255.255.255.224 gw 172.x.y.62

auto eth0

iface eth0 inet static

address 10.1.1.1

netmask 255.255.255.0

network 10.1.1.0

broadcast 10.1.1.255

# dns-* options are implemented by the resolvconf package, if installed

dns-nameservers 10.1.1.1 127.0.0.1

dns-search cluster

解决方法:

此设置不起作用,因为别名接口在传统模式下无法使用网关(aka：/ etc / network / interfaces：

An alias interface should not have “gateway” or “dns-nameservers”;

dynamic IP assignment is permissible.

如果你使用ip在post-up上定义这条路线怎么样？

ip route通过x.x.x.x dev eth0：1添加默认值

这里唯一的问题是使用iproute你可能需要创建2个规则,每个链接一个,并设置优先级,同时保持默认表为空. LARC是你的朋友 – http://www.lartc.org/howto/lartc.rpdb.multiple-links.html

为什么使用iproute2而不是路由？因为路由,arp,ifconfig和它的朋友都是旧工具并且在deprecated的过程中,但是一些发行版仍然发布它们.

标签：linux,routing,networking,ip,ethernet

来源： https://codeday.me/bug/20190814/1655520.html