场景：
教室的电脑网段是172.16.30.0/24 一些学习资料和yum源的ip是172.16.8.100
默认的情况下教室的电脑是可以互通以及连接教学ftp172.16.8.100
现在需要上网可是用安卓手机usb共享电脑上网后发现，172.16.30.0网段是通的，但就是上不了网，要上网就只能禁用eth0
网卡：
电脑eth0 通过网线连接内网 172.16.30.0/24 网关172.16.30.254
手机usb0 通过wifi连接外网 192.168.42.0/24 网关192.168.42.129
最终效果：电脑连接老师VNC 正常连接教学资料ftp：172.16.8.100 正常 连接外网正常
包括kvm里192.168.122.0 网段也可以连通ftp了 而且连通外网正常
解决过程：
[[email protected] ~]# route #查看路由表 Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 172.16.30.0 * 255.255.255.0 U 1 0 0 eth0 192.168.42.0 * 255.255.255.0 U 1 0 0 usb0 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 default bogon 0.0.0.0 UG 0 0 0 eth0 [[email protected] ~]# route add default gw 192.168.42.129 #添加网关 [[email protected] ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 172.16.30.0 * 255.255.255.0 U 1 0 0 eth0 192.168.42.0 * 255.255.255.0 U 1 0 0 usb0 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 default bogon 0.0.0.0 UG 0 0 0 usb0 default bogon 0.0.0.0 UG 0 0 0 eth0 [[email protected] ~]# route add -net 192.168.42.0 netmask 255.255.255.0 dev usb0 #设置192.168.42.0网段默认使用usb0网卡 [[email protected] ~]# ping 172.16.8.100 #这个时候还是不通 PING 172.16.8.100 (172.16.8.100) 56(84) bytes of data. ^C --- 172.16.8.100 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1437ms [[email protected] ~]# route add -net 172.16.8.0 netmask 255.255.255.0 dev eth0 #设置172.16.8.0网段默认使用eth0网卡 [[email protected] ~]# ping 172.16.8.100 PING 172.16.8.100 (172.16.8.100) 56(84) bytes of data. 64 bytes from 172.16.8.100: icmp_seq=1 ttl=63 time=2.60 ms ^C --- 172.16.8.100 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 934ms rtt min/avg/max/mdev = 2.609/2.609/2.609/0.000 ms [[email protected] ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 172.16.30.0 * 255.255.255.0 U 1 0 0 eth0 192.168.42.0 * 255.255.255.0 U 0 0 0 usb0 192.168.42.0 * 255.255.255.0 U 1 0 0 usb0 172.16.8.0 * 255.255.255.0 U 0 0 0 eth0 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 default bogon 0.0.0.0 UG 0 0 0 usb0 default bogon 0.0.0.0 UG 0 0 0 eth0 [[email protected] ~]#
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时间： 2024-11-09 15:59:14