2012年3月18日日曜日

ルーティングテーブル(FIB)、ルーティングキャッシュ

LinuxではルーティングテーブルのことをFIB(Forwarding Information Base)と呼ぶ。一度参照されたら routing cache にキャッシュされる。

これらを表示するコマンドは何通りかある。

route コマンド
# route -F
Kernel IP routing table
Destination     Gateway         Genmask          Flags Metric Ref      Use Iface
172.16.78.0     *               255.255.255.0    U     0      0          0 eth0
(略)
# route -C
Kernel IP routing cache
Source          Destination     Gateway         Flags Metric Ref   Use Iface
192.168.105.1   192.168.105.130 192.168.105.130 il    0      0      29 lo
(略)
netstat コマンド
# netstat -r
Kernel IP routing table
(略)
# netstat -rC
Kernel IP routing cache
(略)
ip コマンド
# ip route show
172.168.78.0/24 dev eth0  proto kernel   scope link  src 172.16.78.130
(略)
# ip route show cached
192.168.105.128 from 192.168.105.130 dev eth2
    cache  mtu 1500 advmss 1460 hoplimit 64
(略)

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