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When I add the option net.ifnames = 0 biosdevname = 0 in the kernel command, the IP route is incorrect

I added two options net.ifnames=0 biosdevname=0 to grub2 because I want to change the default network name to the old name eth0 on RHEL 7 .

After that, I edited /etc/sysconfig/network to set the default gateway for the machine:

GATEWAY=192.168.88.1

And a customized network interface. When I have only one eth0 network interface, everything works fine.

Here is a route table with one eth0 network interface:

 [ root@devmachine ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.88.1 0.0.0.0 UG 100 0 0 eth0 192.168.88.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0 [ root@devmachine ~]#

But I had a problem with the route table when there were several network interfaces on the network.

 [ root@devmachine ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.88.1 0.0.0.0 UG 100 0 0 eth0 0.0.0.0 192.168.88.1 0.0.0.0 UG 101 0 0 eth1 172.168.0.0 0.0.0.0 255.255.0.0 U 100 0 0 eth1 192.168.88.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0 192.168.88.1 0.0.0.0 255.255.255.255 UH 100 0 0 eth1 [ root@devmachine ~]#

As you can see, the gateway address 192.168.88.1 was added to eth1 on the last line. And the gateway address is added continuously with the new network interface.

 [ root@devmachine network-scripts]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 192.168.88.1 0.0.0.0 UG 100 0 0 eth0 default 192.168.88.1 0.0.0.0 UG 101 0 0 eth1 default 192.168.88.1 0.0.0.0 UG 102 0 0 eth2 172.168.0.0 0.0.0.0 255.255.0.0 U 100 0 0 eth1 172.168.0.0 0.0.0.0 255.255.0.0 U 101 0 0 eth2 192.168.88.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0 192.168.88.1 0.0.0.0 255.255.255.255 UH 100 0 0 eth1 192.168.88.1 0.0.0.0 255.255.255.255 UH 101 0 0 eth2

Actually, the problem only occurs when I added the option net.ifnames=0 to grub2 . Someone will help me.

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1 answer

I think this is possible due to the lack of ifcfg-eth1

 # cd /etc/sysconfig/network-scripts # cp ifcfg-eth0 ifcfg-eth1
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Source: https://habr.com/ru/post/1241129/

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