路由表和(iproute2与网络工具)

Question

我有下列路由表：

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.42.129  0.0.0.0         UG    0      0        0 enx6a58445c5d43
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 enx6a58445c5d43
192.168.42.0    0.0.0.0         255.255.255.0   U     0      0        0 enx6a58445c5d43
192.168.57.0    0.0.0.0         255.255.255.0   U     0      0        0 vboxnet1

当我使用以下命令时，会得到错误：

# ip route add 192.168.42.0/24 via  192.168.57.1 dev vboxnet1
RTNETLINK answers: File exists

但是当我使用网络工具时，我没有发现任何错误：

# route add -net 192.168.42.0/24 gw   192.168.57.1 dev vboxnet1
# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.42.129  0.0.0.0         UG    0      0        0 enx6a58445c5d43
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 enx6a58445c5d43
192.168.42.0    192.168.57.1    255.255.255.0   UG    0      0        0 vboxnet1 ####add here
192.168.42.0    0.0.0.0         255.255.255.0   U     0      0        0 enx6a58445c5d43
192.168.57.0    0.0.0.0         255.255.255.0   U     0      0        0 vboxnet1

问题是:如何通过iproute2添加？

Answer 1

您的路由表中有网络地址192.168.42.0/24。所以你必须：

ip route replace 192.168.42.0/24 via 192.168.57.1 dev vboxnet1 

或

ip route del 192.168.42.0/24 
ip route add 192.168.42.0/24 via 192.168.57.1 dev vboxnet1