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NIC alias
1. CentOS
  1. 設定
  2. dhcpについて
2. Ubuntu

NIC alias

一つの物理NICに複数のIPを割り当てる

CentOS

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

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？
- 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？
- 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

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) ...

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.

install udhcpc package
- sudo aptitude install -R udhcpc
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
```

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 ]

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0c:29:YY:YY:YY
          inet addr:192.168.40.146  Bcast:192.168.40.255  Mask:255.255.255.0
(snip)

eth0:0    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
(snip)

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
  - ifup eth0:0ではassignされない
```
ifup: interface eth0:0 already configured
```
- rcS.dあたりで対応する必要がある？ (未検証)

Last modified 15 years ago Last modified on Jun 9, 2009 4:47:05 AM

Attachments (3)

centos-alias.png (3.2 KB) - added by mitty 15 years ago.
dhcp3-client-dummy_3.0.6.dfsg-1ubuntu9_i386.deb (2.2 KB) - added by mitty 15 years ago. copy from http://launchpadlibrarian.net/25005944/dhcp3-client-dummy_3.0.6.dfsg-1ubuntu9_i386.deb
hardy-udhcpc.png (11.7 KB) - added by mitty 15 years ago.

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