0x1af4 " l4(TmJq@qn1h h 0x8086 # la?Jƚ*bѿ  0 #!/bin/bash # # configures aliases of device $1 # # This script goes out of its way to arrive at the configuration of ip # aliases described in the ifcfg-$DEV:* and ifcfg-$DEV-range* files from # whatever existing configuration it may be given: existing aliases not # specified in the configuration will be removed, netmasks and broadcast # addrs will be updated on existing aliases, and new aliases will be setup. # # range specification files: # # One can specify ranges of alised ipaddress using ifcfg-$DEV-range* files. # Specify multiple ranges using multiple files, such as ifcfg-eth0-range0 and # ifcfg-eth0-range1, etc. In these files, the following configuration variables # specify the range: # # IPADDR_START -- ipaddr to start range at. eg "192.168.30.1" # IPADDR_END -- ipaddr to end range at. eg "192.168.30.254" # CLONENUM_START -- interface clone number to start using for this range. eg "0" # # The above example values create the interfaces eth0:0 through eth0:253 using # ipaddrs 192.168.30.1 through 192.168.30.254, inclusive. # # Other configuration variables such as NETMASK and BROADCAST may be specified # in the range file and will apply to all of the ipaddresses in the range. Range # files also inherit configuration from the ifcfg-$DEV file just like normal. # # Note that IPADDR_START and IPADR_END are required to be in the same class-c # block. I.e. IPADDR_START=192.168.30.1 and IPADDR_END=192.168.31.255 is # not valid. # # speed with large sets of interfaces: # # Considerable effort was spent making this script fast. It can efficiently # handle a thousand ip aliases on one interface. # # With large sets of ipaddresses the NO_ALIASROUTING=yes configuration is # highly recommended. (This can be specified in ifcfg-$DEV and inherited.) This # prevents this script from setting up routing details for the virtual # interfaces, which I don't think is needed, because outgoing traffic can use the # main interface. However, make your own conclusions on what you need. # # My test setup of four class C address blocks on a P166 took 25 seconds of # which 16 seconds of this was spent in the ifcconfig calls. Without the # NO_ALIASROUTING=yes config an additional 12 seconds is spent in route calls. # # notes on internals: # # This script uses the bash "eval" command to lookup shell variables with names # which are generated from other shell variables. This allows us to, in effect, # create hashes using the shell variable namesspace by just including the hash # key in the name of the variable. # # This script originally written by: David Harris # Principal Engineer, DRH Internet # June 30, 1999 # # modified by: Bill Nottingham TEXTDOMAIN=initscripts TEXTDOMAINDIR=/etc/locale device=$1 if [ "$device" = "" ]; then echo $"usage: ifup-aliases []\n" exit 1 fi PARENTCONFIG=${2:-ifcfg-$device} parent_device=$device cd /etc/sysconfig/network-scripts . ./network-functions # Grab the current configuration of any running aliases, place device info # into variables of the form: # rdev__addr = # rdev__pb = _ # rdevip_ = # Example: # rdev_0_addr=192.168.1.1 # rdev_0_pb=24_192.16.1.255 # rdevip_192_168_1_1=0 # # A list of all the devices is created in rdev_LIST. eval $( ip addr show $device label $device:* | \ awk 'BEGIN { COUNT=0;LAST_DEV="" } /inet / { # Split IP address into address/prefix split($2,IPADDR,"/"); # Create A_B_C_D IP address form IP_ADDR=IPADDR[1]; gsub(/\./,"_",IP_ADDR); # Split device into device:index split($NF,DEV,":"); # Update last device LAST_DEV=LAST_DEV " " DEV[2]; printf("rdev_%s_addr=%s\nrdevip_%s=%s\nrdev_%s_pb=%s_%s\nrdev_LIST=\"%s\"\n", DEV[2],IPADDR[1],