wiki:TipAndDoc/VM/network

Version 4 (modified by mitty, 15 years ago) (diff)

--

VMによるネットワークテスト

    network map

                          WAN
                           |
                           |
                     Windows (NAT)
                     192.168.40.1
                           |
                           |
                ((( 192.168.40.0/24 )))
                 |                   |
                 |                   |
            192.168.40.10     192.168.40.20
                 |                   *
               <eth0>              <eth0>
          [[ubuntu-outer]]   <<centos-outer>>
               <eth1>              <eth1>
                 *(10.0.0.254)       |
               10.0.0.10       10.0.0.20
                      |         |
                      |         |
                     (10.0.0.0/16)
                           |
                           |
                      10.0.0.254
                           *(10.0.0.20)
                         <eth0>
                   <<ubuntu-router>>
                  <eth1>        <eth2>
                    |             |
              10.1.0.254         10.2.0.254
                   |                      |
                   |                      |
        ((((( 10.1.0.0/16 )))))          ((((( 10.2.0.0/16 )))))
        |          |      |   |             |      |  |       |
        |          |      |   |             |      |  |       |
    10.1.0.10  10.1.0.20  |  10.1.0.30  10.2.0.30  |  |       |
        *          |      |   |             *      /  |       |
      <eth0>     <eth1>   |  <eth0>     <eth1>    /   |       |
     [[ubuntu-inner-AA]]  | [[ubuntu-inner-AB]]  /    |       |
                          |                     /     |       |
                          |                    /      |       |
                     10.1.0.110        10.2.0.110  10.2.0.10  10.2.0.20
                          |             |             *          |
                         <eth1>     <eth2>          <eth0>     <eth1>
                          [[centos-inner]]         [[ubuntu-inner-BB]]
                               <eth0>
                                 *
                          192.168.50.110
                                 |
                                 |
                           192.168.50.1
                           Windows (NAT)
                                 |
                                 |
                                WAN
    
    • ((()))
      • LANセグメント
    • [[]]
      • 通常ノード
    • <<>>
      • net.ipv4.ip_forward=1 になっているノード
    • * が付いているNIC
      • デフォルトゲートウェイ
      • 候補が複数ある場合で、()で明示されていなければ、X.X.X.254がGW

    問題点

    • (10.0.0.0/16) にデフォルトゲートウェイが二つ設定されている
      • ubuntu-outer -> 10.0.0.254(ubuntu-router)
      • ubuntu-router -> 10.0.0.20(centos-outer)
      • 解消版 => TipAndDoc/network/vmtest2
    • IP masquerade設定がない

    設定

    centos-outer

    • centos-outer ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
      DEVICE=eth0
      BOOTPROTO=static
      IPADDR=192.168.40.20
      NETMASK=255.255.255.0
      NETWORK=192.168.40.0
      GATEWAY=192.168.40.1
      ONBOOT=yes
      
    • centos-outer ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
      DEVICE=eth1
      BOOTPROTO=static
      IPADDR=10.0.0.20
      NETMASK=255.255.0.0
      NETWORK=10.0.0.0
      ONBOOT=yes
      
    • centos-outer ~]# route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      192.168.40.0    *               255.255.255.0   U     0      0        0 eth0
      10.0.0.0        *               255.255.0.0     U     0      0        0 eth1
      169.254.0.0     *               255.255.0.0     U     0      0        0 eth1
      default         192.168.40.1    0.0.0.0         UG    0      0        0 eth0
      
    • centos-outer ~]# ip route
      192.168.40.0/24 dev eth0  proto kernel  scope link  src 192.168.40.20
      10.0.0.0/16 dev eth1  proto kernel  scope link  src 10.0.0.20
      169.254.0.0/16 dev eth1  scope link
      default via 192.168.40.1 dev eth0
      

    ubuntu-outer

    • ubuntu-outer:~$ cat /etc/network/interfaces
      auto lo
      iface lo inet loopback
      
      auto eth0
      iface eth0 inet static
              address 192.168.40.10
              netmask 255.255.255.0
              network 192.168.40.0
      
      auto eth1
      iface eth1 inet static
              address 10.0.0.10
              netmask 255.255.0.0
              network 10.0.0.0
              gateway 10.0.0.254
      
    • ubuntu-outer:~$ route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      192.168.40.0    *               255.255.255.0   U     0      0        0 eth0
      10.0.0.0        *               255.255.0.0     U     0      0        0 eth1
      default         10.0.0.254      0.0.0.0         UG    100    0        0 eth1
      
    • ubuntu-outer:~$ ip route
      192.168.40.0/24 dev eth0  proto kernel  scope link  src 192.168.40.10
      10.0.0.0/16 dev eth1  proto kernel  scope link  src 10.0.0.10
      default via 10.0.0.254 dev eth1  metric 100
      

    ubuntu-router

    • ubuntu-router:~$ cat /etc/network/interfaces
      auto lo
      iface lo inet loopback
      
      auto eth0
      iface eth0 inet static
              address 10.0.0.254
              netmask 255.255.0.0
              network 10.0.0.0
              gateway 10.0.0.20
      
      auto eth1
      iface eth1 inet static
              address 10.1.0.254
              netmask 255.255.0.0
              network 10.1.0.0
      
      auto eth2
      iface eth2 inet static
              address 10.2.0.254
              netmask 255.255.0.0
              network 10.2.0.0
      
    • ubuntu-router:~$ route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      10.2.0.0        *               255.255.0.0     U     0      0        0 eth2
      10.0.0.0        *               255.255.0.0     U     0      0        0 eth0
      10.1.0.0        *               255.255.0.0     U     0      0        0 eth1
      default         10.0.0.20       0.0.0.0         UG    100    0        0 eth0
      
    • ubuntu-router:~$ ip route
      10.2.0.0/16 dev eth2  proto kernel  scope link  src 10.2.0.254
      10.0.0.0/16 dev eth0  proto kernel  scope link  src 10.0.0.254
      10.1.0.0/16 dev eth1  proto kernel  scope link  src 10.1.0.254
      default via 10.0.0.20 dev eth0  metric 100
      

    ubuntu-inner-AA

    • ubuntu-inner-AA:~$ cat /etc/network/interfaces
      auto lo
      iface lo inet loopback
      
      auto eth0
      iface eth0 inet static
              address 10.1.0.10
              netmask 255.255.0.0
              network 10.1.0.0
              gateway 10.1.0.254
      
      auto eth1
      iface eth1 inet static
              address 10.1.0.20
              netmask 255.255.0.0
              network 10.1.0.0
      
    • ubuntu-inner-AA:~$ route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      10.1.0.0        *               255.255.0.0     U     0      0        0 eth0
      10.1.0.0        *               255.255.0.0     U     0      0        0 eth1
      default         10.1.0.254      0.0.0.0         UG    100    0        0 eth0
      
    • ubuntu-inner-AA:~$ ip route
      10.1.0.0/16 dev eth0  proto kernel  scope link  src 10.1.0.10
      10.1.0.0/16 dev eth1  proto kernel  scope link  src 10.1.0.20
      default via 10.1.0.254 dev eth0  metric 100
      

    ubuntu-inner-AB

    • ubuntu-inner-AB:~$ cat /etc/network/interfaces

    {{{auto lo iface lo inet loopback

    auto eth0 iface eth0 inet static

    address 10.1.0.30 netmask 255.255.0.0 network 10.1.0.0

    auto eth1 iface eth1 inet static

    address 10.2.0.30 netmask 255.255.0.0 network 10.2.0.0 gateway 10.2.0.254

    }}}

    • ubuntu-inner-AB:~$ route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      10.2.0.0        *               255.255.0.0     U     0      0        0 eth1
      10.1.0.0        *               255.255.0.0     U     0      0        0 eth0
      default         10.2.0.254      0.0.0.0         UG    100    0        0 eth1
      
    • ubuntu-inner-AB:~$ ip route
      10.2.0.0/16 dev eth1  proto kernel  scope link  src 10.2.0.30
      10.1.0.0/16 dev eth0  proto kernel  scope link  src 10.1.0.30
      default via 10.2.0.254 dev eth1  metric 100
      

    ubuntu-inner-BB

    • ubuntu-inner-BB:~$ cat /etc/network/interfaces
      auto lo
      iface lo inet loopback
      
      auto eth0
      iface eth0 inet static
              address 10.2.0.10
              netmask 255.255.0.0
              network 10.2.0.0
              gateway 10.2.0.254
      
      auto eth1
      iface eth1 inet static
              address 10.2.0.20
              netmask 255.255.0.0
              network 10.2.0.0
      
    • ubuntu-inner-BB:~$ route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      10.2.0.0        *               255.255.0.0     U     0      0        0 eth0
      10.2.0.0        *               255.255.0.0     U     0      0        0 eth1
      default         10.2.0.254      0.0.0.0         UG    100    0        0 eth0
      
    • ubuntu-inner-BB:~$ ip route
      10.2.0.0/16 dev eth0  proto kernel  scope link  src 10.2.0.10
      10.2.0.0/16 dev eth1  proto kernel  scope link  src 10.2.0.20
      default via 10.2.0.254 dev eth0  metric 100
      

    centos-inner

    • centos-inner ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
      DEVICE=eth0
      BOOTPROTO=static
      IPADDR=192.168.50.110
      NETMASK=255.255.255.0
      NETWORK=192.168.50.0
      GATEWAY=192.168.50.1
      ONBOOT=yes
      
    • centos-inner ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
      DEVICE=eth1
      BOOTPROTO=static
      IPADDR=10.1.0.110
      NETMASK=255.255.0.0
      NETWORK=10.1.0.0
      ONBOOT=yes
      
    • centos-inner ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth2
      DEVICE=eth2
      BOOTPROTO=static
      IPADDR=10.2.0.110
      NETMASK=255.255.0.0
      NETWORK=10.2.0.0
      ONBOOT=yes
      
    • centos-inner ~]# route
      Kernel IP routing table
      Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      192.168.50.0    *               255.255.255.0   U     0      0        0 eth0
      10.2.0.0        *               255.255.0.0     U     0      0        0 eth2
      10.1.0.0        *               255.255.0.0     U     0      0        0 eth1
      169.254.0.0     *               255.255.0.0     U     0      0        0 eth2
      default         192.168.50.1    0.0.0.0         UG    0      0        0 eth0
      
    • centos-inner ~]# ip route
      192.168.50.0/24 dev eth0  proto kernel  scope link  src 192.168.50.110
      10.2.0.0/16 dev eth2  proto kernel  scope link  src 10.2.0.110
      10.1.0.0/16 dev eth1  proto kernel  scope link  src 10.1.0.110
      169.254.0.0/16 dev eth2  scope link
      default via 192.168.50.1 dev eth0