[[PageOutline]] * https://wiki.ubuntu.com/vlan * [http://manpages.ubuntu.com/manpages/precise/man5/vlan-interfaces.5.html Ubuntu Manpage: /etc/network/interfaces (vlan) - vlan extensions for the interfaces(5)] * [http://cequiestaime.blogspot.jp/2013/01/ubuntu-1004vlanbondinglink-aggregation.html やっ太郎ブログ: ubuntu 10.04でvlan×bonding×link aggregation太郎] * [http://www.slideshare.net/oraccha/ioio-14060300 I/O仮想化最前線〜ネットワークI/Oを中心に〜] p.38 > ちなみにレガシーブリッジでは、VLANごとにブリッジの作成が必要 > 例) tap <-> br0_101 <-> eth0.101 * [http://buffalo.jp/products/catalog/network/setting_ex/bs/g20/vlan-internet/ 設定事例集：インターネットマンションで使用する（BSシリーズ Gigaスイッチ）| BUFFALO バッファロー] > ※PVID とは、Port VLAN ID の意味で、ポートに設定されたPVID により、タグ無しのパケットを受信した場合、どのVLAN に送信するかを決定します。タグ付きのパケットを受信した場合は、PVID とは関係なくタグの送信するパケットのVLAN IDを参照し、送信先のVLAN を決定します。 * VLAN ID 1 は多くのインテリジェントスイッチでマネージメント用に予約されているため、非推奨 * mitty@vlan-gw:~$ sudo vconfig add eth1 1 {{{ Added VLAN with VID == 1 to IF -:eth1:- WARNING: VLAN 1 does not work with many switches, consider another number if you have problems. }}} = Bridging VLAN = * 概念図[[br]][[Image(bridging-vlan.png,33%)]] * 目的 * vlan-gwのeth0にL2で抜けるルートがvlan-node上に欲しい * vlan-gwのeth0 <-> eth1で直接ブリッジするのは困る * vlan-nodeは本来NAPT下にある、など * VLANにすることで、NICを増やしたりすることなく複数サブネットを得る == make bridge on vlan-gw == 1. mitty@vlan-gw:~$ sudo vconfig add eth1 10 {{{ Added VLAN with VID == 10 to IF -:eth1:- }}} * mitty@vlan-gw:~$ ifconfig eth1.10 {{{ eth1.10 Link encap:Ethernet HWaddr 00:16:3e:3d:4f:ca }}} 1. mitty@vlan-gw:~$ sudo brctl addbr br-gw 1. mitty@vlan-gw:~$ sudo brctl addif br-gw eth1.10 * mitty@vlan-gw:~$ brctl show {{{ bridge name bridge id STP enabled interfaces br-gw 8000.00163e3d4fca no eth1.10 }}} * mitty@vlan-gw:~$ ifconfig | grep addr {{{ br-gw Link encap:Ethernet HWaddr 00:16:3e:3d:4f:ca eth0 Link encap:Ethernet HWaddr 00:16:3e:3d:4f:c9 inet addr:192.168.0.185 Bcast:192.168.0.255 Mask:255.255.255.0 eth1 Link encap:Ethernet HWaddr 00:16:3e:3d:4f:ca eth1.10 Link encap:Ethernet HWaddr 00:16:3e:3d:4f:ca }}} 1. mitty@vlan-gw:~$ sudo brctl addif br-gw eth0 * このコマンドにより、eth0を通じて192.168.0.185でアクセスしている場合はいったん切断されるため、リモートから操作している場合などは注意 * mitty@vlan-gw:~$ brctl show {{{ bridge name bridge id STP enabled interfaces br-gw 8000.00163e3d4fc9 no eth0 eth1.10 }}} 1. mitty@vlan-gw:~$ sudo ifconfig eth0 0.0.0.0 1. mitty@vlan-gw:~$ sudo ifconfig br-gw 192.168.0.185 netmask 255.255.255.0 1. mitty@vlan-gw:~$ sudo ifconfig eth1.10 up 1. mitty@vlan-gw:~$ sudo ifconfig br-gw up == add vlan nic on vlan-node == 1. mitty@vlan-node:~$ sudo vconfig add eth0 10 {{{ Added VLAN with VID == 10 to IF -:eth0:- }}} 1. mitty@vlan-node:~$ sudo ifconfig eth0.10 192.168.0.13 netmask 255.255.255.0 * 上流(192.168.0.0/24)にdhcpdがあるのであればdhclientなどを使うことも出来る 1. mitty@vlan-node:~$ sudo ifconfig eth0.10 up * mitty@vlan-node:~$ ifconfig | grep addr {{{ eth0 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:10.0.0.2 Bcast:10.255.255.255 Mask:255.0.0.0 eth0.10 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:192.168.0.13 Bcast:192.168.0.255 Mask:255.255.255.0 }}} * vlan-gw:eth1 <-> vlan-node:eth0 は10.0.0.0/8 == check connection == * mitty@vlan-node:~$ sudo tcpdump -i eth0.10 {{{ 04:35:02.147257 1c:c1:ww:xx:yy:zz > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 74: 192.168.0.102 > 192.168.0.13: ICMP echo request, id 1, seq 38, length 40 04:35:02.147290 00:16:3e:d1:69:13 > 1c:c1:ww:xx:yy:zz, ethertype IPv4 (0x0800), length 74: 192.168.0.13 > 192.168.0.102: ICMP echo reply, id 1, seq 38, length 40 04:35:03.149340 1c:c1:ww:xx:yy:zz > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 74: 192.168.0.102 > 192.168.0.13: ICMP echo request, id 1, seq 39, length 40 04:35:03.149373 00:16:3e:d1:69:13 > 1c:c1:ww:xx:yy:zz, ethertype IPv4 (0x0800), length 74: 192.168.0.13 > 192.168.0.102: ICMP echo reply, id 1, seq 39, length 40 }}} * mitty@vlan-node:~$ sudo tcpdump -i eth0 {{{ 04:35:02.147257 1c:c1:ww:xx:yy:zz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.102 > 192.168.0.13: ICMP echo request, id 1, seq 38, length 40 04:35:02.147293 00:16:3e:d1:69:13 > 1c:c1:ww:xx:yy:zz, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.13 > 192.168.0.102: ICMP echo reply, id 1, seq 38, length 40 04:35:03.149340 1c:c1:ww:xx:yy:zz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.102 > 192.168.0.13: ICMP echo request, id 1, seq 39, length 40 04:35:03.149376 00:16:3e:d1:69:13 > 1c:c1:ww:xx:yy:zz, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.13 > 192.168.0.102: ICMP echo reply, id 1, seq 39, length 40 04:35:11.744387 00:16:3e:3d:4f:ca > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Request who-has 10.0.0.2 tell 10.0.0.1, length 28 04:35:11.744428 00:16:3e:d1:69:13 > 00:16:3e:3d:4f:ca, ethertype ARP (0x0806), length 42: Reply 10.0.0.2 is-at 00:16:3e:d1:69:13, length 28 04:35:11.744471 00:16:3e:3d:4f:ca > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 98: 10.0.0.1 > 10.0.0.2: ICMP echo request, id 1165, seq 1, length 64 04:35:11.744489 00:16:3e:d1:69:13 > 00:16:3e:3d:4f:ca, ethertype IPv4 (0x0800), length 98: 10.0.0.2 > 10.0.0.1: ICMP echo reply, id 1165, seq 1, length 64 04:35:12.744806 00:16:3e:3d:4f:ca > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 98: 10.0.0.1 > 10.0.0.2: ICMP echo request, id 1165, seq 2, length 64 04:35:12.744831 00:16:3e:d1:69:13 > 00:16:3e:3d:4f:ca, ethertype IPv4 (0x0800), length 98: 10.0.0.2 > 10.0.0.1: ICMP echo reply, id 1165, seq 2, length 64 }}} == dhcp on VLAN == * mitty@vlan-node:~$ cat /etc/network/interfaces {{{ auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto vlan10 iface vlan10 inet dhcp vlan-raw-device eth0 }}} * mitty@vlan-node:~$ ifconfig | grep addr {{{ eth0 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 vlan10 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:192.168.0.199 Bcast:192.168.0.255 Mask:255.255.255.0 }}} * eth0側にはIPが割り振られていない(期待通り) * vlan10とeth0.10は同じ -> {{{man 5 vlan-interfaces}}} * mitty@vlan-node:~$ sudo tcpdump -i eth0 {{{ ... 05:01:18.183019 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:01:28.750340 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:01:43.031794 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.942903 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.944507 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 354: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 308 05:02:02.944977 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.947171 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 365: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 319 05:02:03.125276 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP, Request who-has 192.168.0.1 tell 192.168.0.199, length 28 05:02:03.125419 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 64: vlan 10, p 0, ethertype ARP, Reply 192.168.0.1 is-at 00:24:wx:yz:wx:yz, length 46 05:02:22.984115 1c:c1:zz:yy:xx:ww > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 64: vlan 10, p 0, ethertype ARP, Request who-has 192.168.0.199 tell 192.168.0.102, length 46 05:02:22.984148 00:16:3e:d1:69:13 > 1c:c1:zz:yy:xx:ww, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP, Reply 192.168.0.199 is-at 00:16:3e:d1:69:13, length 28 05:02:22.984242 1c:c1:zz:yy:xx:ww > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.102 > 192.168.0.199: ICMP echo request, id 1, seq 42, length 40 05:02:22.984275 00:16:3e:d1:69:13 > 1c:c1:zz:yy:xx:ww, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.199 > 192.168.0.102: ICMP echo reply, id 1, seq 42, length 40 05:02:23.986581 1c:c1:zz:yy:xx:ww > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.102 > 192.168.0.199: ICMP echo request, id 1, seq 43, length 40 05:02:23.986609 00:16:3e:d1:69:13 > 1c:c1:zz:yy:xx:ww, ethertype 802.1Q (0x8100), length 78: vlan 10, p 0, ethertype IPv4, 192.168.0.199 > 192.168.0.102: ICMP echo reply, id 1, seq 43, length 40 }}} * mitty@vlan-gw:~$ sudo tcpdump -i eth1 {{{ 04:57:01.612502 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 04:57:04.284819 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 04:57:12.426705 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 ... 05:01:18.183048 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:01:28.750367 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:01:43.031819 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.942934 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.944491 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 354: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 308 05:02:02.945004 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 05:02:02.947157 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 365: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 319 05:02:03.125309 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP, Request who-has 192.168.0.1 tell 192.168.0.199, length 28 05:02:03.125410 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 64: vlan 10, p 0, ethertype ARP, Reply 192.168.0.1 is-at 00:24:wx:yz:wx:yz, length 46 }}} * 起動時、eth0側のdhcpタイムアウト待ちをするため、vlan10にIPが振ってくるまで2分ほど遅延する * vlan-node:/etc/network/interfaces {{{ iface eth0 inet manual }}} * などにするとよい == dhcpd on another network == * 概念図[[br]][[Image(bridging-vlan-with-dhcpd.png,33%)]] * vlan-gw:eth1 <-> vlan-node:eth0 に192.168.1110/24でdhcpdを建てる * mitty@vlan-gw:~$ sudo ifconfig eth1.10 down * mitty@vlan-node:~$ cat /etc/network/interfaces {{{ auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto vlan10 iface vlan10 inet dhcp vlan-raw-device eth0 }}} * mitty@vlan-node:~$ ifconfig | grep addr {{{ eth0 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:192.168.111.102 Bcast:192.168.111.255 Mask:255.255.255.0 vlan10 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 }}} * vlan-node:vlan10にはdhcpでIPが割り振られることはない(期待通り) * mitty@vlan-gw:~$ sudo ifconfig eth1.10 up * mitty@vlan-node:~$ ifconfig {{{ eth0 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:192.168.111.102 Bcast:192.168.111.255 Mask:255.255.255.0 vlan10 Link encap:Ethernet HWaddr 00:16:3e:d1:69:13 inet addr:192.168.0.199 Bcast:192.168.0.255 Mask:255.255.255.0 }}} * mitty@vlan-node:~$ sudo tcpdump -i eth0 {{{ 10:03:25.576221 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 10:03:26.577102 00:1b:zz:yy:xx:ww > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 192.168.111.102.68: BOOTP/DHCP, Reply, length 300 10:03:26.577404 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 10:03:26.702221 00:1b:zz:yy:xx:ww > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 192.168.111.102.68: BOOTP/DHCP, Reply, length 300 10:03:26.940715 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 10:03:26.941123 00:1b:zz:yy:xx:ww > 00:16:3e:d1:69:13, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 192.168.111.102.68: BOOTP/DHCP, Reply, length 300 10:03:26.942027 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 354: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 308 10:03:26.942392 00:16:3e:d1:69:13 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:3e:d1:69:13, length 300 10:03:26.942676 00:1b:zz:yy:xx:ww > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 300 10:03:26.944592 00:24:wx:yz:wx:yz > 00:16:3e:d1:69:13, ethertype 802.1Q (0x8100), length 365: vlan 10, p 0, ethertype IPv4, 192.168.0.1.67 > 192.168.0.199.68: BOOTP/DHCP, Reply, length 319 }}} * VLAN ID 10でのDHCP requestに対して、192.168.111.1のdhcpdがVLAN ID無しでreplayしている模様 * DHCPd(isc-dhcp-server)はtaggedかどうかを無視する？ * [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=643564 #643564 - isc-dhcp-server: responds to vlan tagged packets on untagged interface - Debian Bug report logs] = VLAN with VMware Workstation on Windows = * WindowsはOSとしてはtag VLANに対応して居ない * [http://diary.sshida.com/20090208-2-diary.html vmware workstation は VLAN 非対応] > ホストOSで、Tag VLANを切って、その上で、vmware が対応するタグVLAN I/F をゲストOSに割り当てればよい。そういう意味では、ゲストOSからはTag VLANではなくて別インターフェースになる。 > 使いにくいといえば使いにくい。特にWindowsホストOSの場合はWindows自体がTag VLAN に対応していないのでめんどう。Ethernetカード専用のドライバでの対応になる。 * [http://communities.vmware.com/thread/259263 VMware Communities: Windows 7/vista and VLAN Tagging...] * Windowsホスト上にVMware WorkstationでLinuxゲストを作り、仮想NICをブリッジしてVLAN deviceを作成しても、うまく疎通出来ない * mitty@vmware:~$ ifconfig -a | grep addr {{{ eth0 Link encap:Ethernet HWaddr 00:0c:29:4b:23:a8 inet addr:192.168.111.103 Bcast:192.168.111.255 Mask:255.255.255.0 }}} 1. mitty@vmware:~$ sudo modprobe 8021q 1. mitty@vmware:~$ sudo vconfig add eth0 10 {{{ Added VLAN with VID == 10 to IF -:eth0:- }}} 1. mitty@vmware:~$ sudo ifconfig eth0.10 up 1. mitty@vmware:~$ sudo dhclient eth0.10 * mitty@vmware:~$ sudo tcpdump -i eth0 {{{ 12:19:40.630473 00:0c:29:4b:23:a8 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:29:4b:23:a8, length 300 12:19:40.632184 00:1b:zz:yy:xx:ww > 00:0c:29:4b:23:a8, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 192.168.111.103.68: BOOTP/DHCP, Reply, length 300 12:19:40.633118 00:24:wx:yz:wx:yz > 00:0c:29:4b:23:a8, ethertype IPv4 (0x0800), length 386: 192.168.0.161.1 > 192.168.0.180.68: BOOTP/DHCP, Reply, length 344 12:19:43.020357 00:0c:29:4b:23:a8 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 346: vlan 10, p 0, ethertype IPv4, 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:29:4b:23:a8, length 300 12:19:43.021589 00:1b:zz:yy:xx:ww > 00:0c:29:4b:23:a8, ethertype IPv4 (0x0800), length 342: 192.168.111.1.67 > 192.168.111.103.68: BOOTP/DHCP, Reply, length 300 12:19:43.022460 00:24:wx:yz:wx:yz > 00:0c:29:4b:23:a8, ethertype IPv4 (0x0800), length 386: 192.168.0.161.1 > 192.168.0.180.68: BOOTP/DHCP, Reply, length 344 }}} * requestはVLAN ID 10となっているが、replyはVLAN IDが無くなってしまっている * mitty@vmware:~$ ifconfig -a | grep addr {{{ eth0 Link encap:Ethernet HWaddr 00:0c:29:4b:23:a8 inet addr:192.168.111.103 Bcast:192.168.111.255 Mask:255.255.255.0 eth0.10 Link encap:Ethernet HWaddr 00:0c:29:4b:23:a8 }}}