[[PageOutline]]

 = VMによるネットワークテスト =
[[TitleIndex(TipAndDoc/network/vmtest,format=group)]]

 == 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 => wiki:TipAndDoc/network/vmtest2
 * IP masquerade設定がない
   * centos-outer, centos-inner以外はWANに出られない
   * => centos-outerにIP masqueradeを設定すればよい => wiki:TipAndDoc/network/vmtest/masquerade

 == 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
}}}