25.3.3. Mapping Subchannels and Network Device Names
25.3.3. Mapping Subchannels and Network Device Names The DEVICE= option in the ifcfg file does not determine the mapping of subchannels to network device names. Instead, the udev rules file /etc/udev/rules.d/70-persistent-net.rules determines which network device channel gets which network device name. When configuring a new network device on System z, the system automatically adds a new rule to that file and assigns the unused device name. You can then edit the values assigned to the NAME= variable for each device. Example content of /etc/udev/rules.d/70-persistent-net.rules :
This file was automatically generated by the /lib/udev/write_net_rules program run by the persistent-net-generator.rules rules file. # You can modify it,as long as you keep each rule on a single line. S/390 qeth device at 0.0.f5f0 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.f5f0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" S/390 ctcm device at 0.0.1000 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="ctcm", KERNELS=="0.0.1000", ATTR{type}=="256", KERNEL=="ctc*", NAME="ctc0" S/390 qeth device at 0.0.8024 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.8024", ATTR{type}=="1", KERNEL=="hsi*", NAME="hsi0" S/390 qeth device at 0.0.8124 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.8124", ATTR{type}=="1", KERNEL=="hsi*", NAME="hsi1" S/390 qeth device at 0.0.1017 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.1017", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3" S/390 qeth device at 0.0.8324 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.8324", ATTR{type}=="1", KERNEL=="hsi*", NAME="hsi3" S/390 qeth device at 0.0.8224 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.8224", ATTR{type}=="1", KERNEL=="hsi*", NAME="hsi2" S/390 qeth device at 0.0.1010 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.1010", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2" S/390 lcs device at 0.0.1240 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="lcs", KERNELS=="0.0.1240", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1" S/390 qeth device at 0.0.1013 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="qeth", KERNELS=="0.0.1013", ATTR{type}=="1", KERNEL=="hsi*", NAME="hsi4"