[[PageOutline]] = NIC alias = * 一つの物理NICに複数のIPを割り当てる == CentOS == * [http://quox.org/tips/linux/redhat.html#net-ipalias Tips Collection - Red Hat Linux] === 設定 === * /etc/sysconfig/network-scripts/ * ifcfg-eth?:? を作る * 書式は通常の ifcfg-eth? と同じ * 例 * dhcp (後述) {{{ DEVICE=eth0:0 BOOTPROTO=dhcp ONBOOT=yes DHCP_HOSTNAME=centos5-test }}} * static {{{ DEVICE=eth0:0 BOOTPROTO=static IPADDR=192.168.40.250 NETMASK=255.255.255.0 GATEWAY=192.168.40.2 ONBOOT=yes DHCP_HOSTNAME=centos5-test }}} * ifconfig (static) {{{ eth0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX inet addr:192.168.40.141 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:102642 errors:0 dropped:0 overruns:0 frame:0 TX packets:1738 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:11384683 (10.8 MiB) TX bytes:234313 (228.8 KiB) Interrupt:59 Base address:0x2000 eth0:0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX inet addr:192.168.40.250 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:59 Base address:0x2000 }}} === dhcpについて === * 以下の問題は、BOOTPROTO=static の際には発生しない模様 * ifup eth0:0 でエラーが出る {{{ Determining IP information for eth0:0...SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address done. }}} * IP自体は正常にassignされる * ifconfig {{{ eth0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX inet addr:192.168.40.141 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:102862 errors:0 dropped:0 overruns:0 frame:0 TX packets:1939 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:11403063 (10.8 MiB) TX bytes:260163 (254.0 KiB) Interrupt:59 Base address:0x2000 eth0:0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX inet addr:192.168.40.142 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:59 Base address:0x2000 }}} * boot時のエラー * attachment:centos-alias.png * IPもassignされず * fconfig eth0:0 {{{ eth0:0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:59 Base address:0x2000 }}} * ifup eth0:0 {{{ Determining IP information for eth0:0...SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address SIOCGIFADDR: Cannot assign requested address SIOCSIFBROADCAST: Cannot assign requested address SIOCSIFBRDADDR: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address done. }}} * assignされず * ifup eth0:0 {{{ Determining IP information for eth0:0...SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address done. }}} * assignされた * ifconfig eth0:0 {{{ eth0:0 Link encap:Ethernet HWaddr 00:0C:29:XX:XX:XX inet addr:192.168.40.141 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:59 Base address:0x2000 }}} * assignされたりされなかったりするため、不安定 == Ubuntu == * [http://quox.org/tips/linux/redhat.html#net-ipalias Tips Collection - Red Hat Linux] * [http://hirokasa.jp/new/?Linux%2Fdebian%2Finterfaces Linux/debian/interfaces - hirokasa.jp] === 設定 === * 全て /etc/network/interfaces に記述 {{{ # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp }}} * 例 * dhcp (後述) {{{ auto eth0:0 iface eth0:0 inet dhcp }}} * static {{{ auto eth0:0 iface eth0:0 inet static address 192.168.40.250 netmask 255.255.255.0 gateway 192.168.40.2 }}} * ifconfig (static) {{{ eth0 Link encap:Ethernet HWaddr 00:0c:29:YY:YY:YY inet addr:192.168.40.144 Bcast:192.168.40.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:feb1:838a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1051 errors:0 dropped:0 overruns:0 frame:0 TX packets:877 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:94083 (91.8 KB) TX bytes:113925 (111.2 KB) Interrupt:17 Base address:0x2000 eth0:0 Link encap:Ethernet HWaddr 00:0c:29:YY:YY:YY inet addr:192.168.40.250 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:17 Base address:0x2000 }}} === static時の問題 === * /etc/network/interfaces {{{ auto eth0:0 iface eth0:0 inet static address 192.168.40.250 netmask 255.255.255.0 gateway 192.168.40.2 }}} * sudo ifup eth0:0 {{{ SIOCSIFFLAGS: Cannot assign requested address }}} * 実際には正常にassign * ifconfig eth0:0 {{{ eth0:0 Link encap:Ethernet HWaddr 00:0c:29:YY:YY:YY inet addr:192.168.40.250 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:17 Base address:0x2000 }}} * rebootしても正常にassignされている * wireless-tools のバグ？ * [https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/123773 Bug #123773 in ifupdown (Ubuntu): “'SIOCSIFFLAGS: Cannot assign requested address' when setting up ip alias”] ==== 対応 ==== * sudo chmod -x /etc/network/if-pre-up.d/wireless-tools * sudo aptitude -R remove wireless-tools (依存関係に問題があり非推奨？) {{{ The following packages are BROKEN: ubuntu-minimal The following packages will be REMOVED: wireless-tools 0 packages upgraded, 0 newly installed, 1 to remove and 0 not upgraded. Need to get 0B of archives. After unpacking 352kB will be freed. The following packages have unmet dependencies: ubuntu-minimal: Depends: wireless-tools but it is not installable Resolving dependencies... The following actions will resolve these dependencies: Remove the following packages: ubuntu-minimal Score is 115 Accept this solution? [Y/n/q/?] }}} === dhcp時の問題 === * CentOSと同様、dhcp時に問題が起きる * dhclientのバグ？ * [https://bugs.launchpad.net/ubuntu/+source/dhcp3/+bug/351378 Bug #351378 in dhcp3 (Ubuntu): “dhclient fails for virtual interfaces (IP aliases)”] * sudo /etc/init.d/networking restart {{{ * Reconfiguring network interfaces... There is already a pid file /var/run/dhclient.eth0.pid with pid 4361 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.0.6 Copyright 2004-2007 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ Listening on LPF/eth0/00:0c:29:YY:YY:YY Sending on LPF/eth0/00:0c:29:YY:YY:YY Sending on Socket/fallback There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072 Internet Systems Consortium DHCP Client V3.0.6 Copyright 2004-2007 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ Listening on LPF/eth0/00:0c:29:YY:YY:YY Sending on LPF/eth0/00:0c:29:YY:YY:YY Sending on Socket/fallback DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4 DHCPOFFER of 192.168.40.144 from 192.168.40.254 DHCPREQUEST of 192.168.40.144 on eth0 to 255.255.255.255 port 67 DHCPACK of 192.168.40.144 from 192.168.40.254 bound to 192.168.40.144 -- renewal in 855 seconds. SIOCSIFFLAGS: Cannot assign requested address Internet Systems Consortium DHCP Client V3.0.6 Copyright 2004-2007 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address Bind socket to interface: No such device Failed to bring up eth0:0. [ OK ] }}} * sudo ifup eth0:0 {{{ SIOCSIFFLAGS: Cannot assign requested address There is already a pid file /var/run/dhclient.eth0:0.pid with pid 134519072 Internet Systems Consortium DHCP Client V3.0.6 Copyright 2004-2007 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ SIOCSIFFLAGS: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address Bind socket to interface: No such device Failed to bring up eth0:0. }}} * boot時は特にエラー表示はないが、assignされない ==== 対応 ==== * dhcp3-clientの代わりにdhcpcdを入れる対策はHardyでは効果なし * https://bugs.launchpad.net/ubuntu/+source/dhcp3/+bug/351378/comments/12 1. install dhcp3-client dummy package => attachment:dhcp3-client-dummy_3.0.6.dfsg-1ubuntu9_i386.deb * sudo dpkg -i dhcp3-client-dummy_3.0.6.dfsg-1ubuntu9_i386.deb {{{ (Reading database ... 15336 files and directories currently installed.) Preparing to replace dhcp3-client 3.0.6.dfsg-1ubuntu9 (using dhcp3-client-dummy_3.0.6.dfsg-1ubuntu9_i386.deb) ... Unpacking replacement dhcp3-client ... dpkg: warning - unable to delete old directory `/var/lib/dhcp3': Directory not empty dpkg: warning - unable to delete old directory `/etc/dhcp3/dhclient-enter-hooks.d': Directory not empty Setting up dhcp3-client (3.0.6.dfsg-1ubuntu9) ... }}} 1. hold dhcp3-client dummy package * sudo aptitude hold dhcp3-client {{{ The following packages have been kept back: dhcp3-client 0 packages upgraded, 0 newly installed, 0 to remove and 1 not upgraded. }}} 1. install udhcpc package * sudo aptitude install -R udhcpc 1. add alias to /etc/network/interfaces * hostname, client-id は必須なのか不明。無くても手元では動作した {{{ auto eth0 iface eth0 inet dhcp auto eth0:0 iface eth0:0 inet dhcp }}} 1. restart NICs * sudo /etc/init.d/networking restart {{{ * Reconfiguring network interfaces... udhcpc (v0.9.9-pre) started Sending discover... Sending select for 192.168.40.146... Lease of 192.168.40.146 obtained, lease time 1800 Resetting default routes adding dns 192.168.40.2 SIOCSIFFLAGS: Cannot assign requested address udhcpc (v0.9.9-pre) started SIOCSIFFLAGS: Cannot assign requested address Sending discover... Sending select for 192.168.40.144... Lease of 192.168.40.144 obtained, lease time 1800 Resetting default routes adding dns 192.168.40.2 [ OK ] }}} * boot時はaliasはassignされない * attachment:hardy-udhcpc.png * assignされているのはeth0のみ * login後に sudo /etc/init.d/networking restart するとassignされる * rcS.dあたりで対応する必要がある？ (未検証)