初探Openstack Neutron DVR
目前在Juno版本的trunk中已经合入了DVR相关的代码，我的理解是在Juno版本中DVR是一个experimental feature。最好需要稳定一个版本以后再上生产环境。之前写过一篇博文是DVR相关的，当时代码还没有实现，与实际的实现有一些出入。当前的DVR的实现是基于VXLAN的。关于VXLAN的优势，有时间会写一些体会，今天暂且不谈。
建议先看一下以下文档，对DVR有一些了解:
https://docs.google.com/presentation/d/1ktCLAdglpKdsC--fQ2F_c2d3X1u-lyRGGUzRu9ITuWo/edit#slide=id.g2b6a14e30_036
https://docs.google.com/presentation/d/1ktCLAdglpKdsC--fQ2F_c2d3X1u-lyRGGUzRu9ITuWo/edit#slide=id.g2b6a14e30_030
然后起了两个私有网络和一个DVR 路由器，拓扑如下:
再看一下虚机private2-compute2-VM的IP和路由:
最终会转发到br-int的qvo4e843b99-fb:
root@dvr-compute1:~# ovs-vsctl show
67f121bd-cca7-41c2-95ab-23ed85d1305b
Bridge br-tun
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port "vxlan-0ae09f91"
Interface "vxlan-0ae09f91"
type: vxlan
options: {df_default="true", in_key=flow, local_ip="10.224.159.141", out_key=flow, remote_ip="10.224.159.145"}
Port "vxlan-0ae09f88"
Interface "vxlan-0ae09f88"
type: vxlan
options: {df_default="true", in_key=flow, local_ip="10.224.159.141", out_key=flow, remote_ip="10.224.159.136"}
Port br-tun
Interface br-tun
type: internal
Bridge br-int
fail_mode: secure
Port "qvo111517d8-c5"
tag: 2
Interface "qvo111517d8-c5"
Port patch-tun
Interface patch-tun
type: patch
options: {peer=patch-int}
Port "qr-001d0ed9-01"
tag: 2
Interface "qr-001d0ed9-01"
type: internal
Port br-int
Interface br-int
type: internal
Port "qr-ddbdc784-d7"
tag: 1
Interface "qr-ddbdc784-d7"
type: internal
Port "qvo4e843b99-fb"
tag: 1
Interface "qvo4e843b99-fb"
Bridge br-ex
Port br-ex
Interface br-ex
type: internal
Port "fg-081d537b-06"
Interface "fg-081d537b-06"
type: internal
ovs_version: "2.0.2"
fip-fbd46644-c70f-4227-a414-862a00cbd1d2
qrouter-0fbb351e-a65b-4790-a409-8fb219ce16aa
qdhcp-401f678d-4518-446c-9a33-cd2fb054c104
qdhcp-db755841-0764-4a8f-b962-8df008ce6330
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
qr-001d0ed9-01 Link encap:Ethernet HWaddr fa:16:3e:69:b4:05
inet addr:10.0.2.1 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe69:b405/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:35 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3510 (3.5 KB) TX bytes:1092 (1.0 KB)
qr-ddbdc784-d7 Link encap:Ethernet HWaddr fa:16:3e:66:13:af
inet addr:10.0.1.1 Bcast:10.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe66:13af/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:401 errors:0 dropped:0 overruns:0 frame:0
TX packets:378 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:38224 (38.2 KB) TX bytes:36224 (36.2 KB)
rfp-0fbb351e-a Link encap:Ethernet HWaddr ea:5c:56:9a:36:9c
inet addr:169.254.31.28 Bcast:0.0.0.0 Mask:255.255.255.254
inet6 addr: fe80::e85c:56ff:fe9a:369c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1116 (1.1 KB) TX bytes:1116 (1.1 KB)
duration=64720.432s, table=1, n_packets=4, n_bytes=168, idle_age=64607,
priority=3,arp,dl_vlan=1,arp_tpa=10.0.1.1 actions=drop
cookie=0x0,
duration=62666.766s, table=1, n_packets=2, n_bytes=84, idle_age=62576,
priority=3,arp,dl_vlan=2,arp_tpa=10.0.2.1 actions=drop
的qrouter-0fbb351e-a65b-4790-a409-8fb219ce16aa 的namespace：
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
32768: from 10.0.1.5 lookup 16
32769: from 10.0.2.3 lookup 16
167772417: from 10.0.1.1/24 lookup 167772417
167772417: from 10.0.1.1/24 lookup 167772417
167772673: from 10.0.2.1/24 lookup 167772673
root@dvr-compute1:~# ip netns exec qrouter-0fbb351e-a65b-4790-a409-8fb219ce16aa ip route list table main
10.0.1.0/24 dev qr-ddbdc784-d7 proto kernel scope link src 10.0.1.1
10.0.2.0/24 dev qr-001d0ed9-01 proto kernel scope link src 10.0.2.1
169.254.31.28/31 dev rfp-0fbb351e-a proto kernel scope link src 169.254.31.28
10.0.1.5 dev qr-ddbdc784-d7 lladdr fa:16:3e:da:75:6d PERMANENT
10.0.2.3 dev qr-001d0ed9-01 lladdr fa:16:3e:a4:fc:98 PERMANENT
10.0.1.6 dev qr-ddbdc784-d7 lladdr fa:16:3e:9f:55:67 PERMANENT
10.0.2.2 dev qr-001d0ed9-01 lladdr fa:16:3e:13:55:66 PERMANENT
10.0.2.5 dev qr-001d0ed9-01 lladdr fa:16:3e:51:99:b8 PERMANENT
10.0.1.4 dev qr-ddbdc784-d7 lladdr fa:16:3e:da:e3:6e PERMANENT
10.0.1.7 dev qr-ddbdc784-d7 lladdr fa:16:3e:14:b8:ec PERMANENT
169.254.31.29 dev rfp-0fbb351e-a lladdr 42:0d:9f:49:63:c6 STALE
root@dvr-compute1:~# ovs-ofctl show br-tun
OFPT_FEATURES_REPLY (xid=0x2): dpid:0000e2b7aa5da34a
n_tables:254, n_buffers:256
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC
SET_DL_DST SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST
ENQUEUE
1(patch-int): addr:76:ae:9f:b3:bf:c6
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
3(vxlan-0ae09f88): addr:92:61:e9:43:dd:99
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
4(vxlan-0ae09f91): addr:2e:cc:c0:4a:4e:d4
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
LOCAL(br-tun): addr:e2:b7:aa:5d:a3:4a
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
n_bytes=5731, idle_age=20810, hard_age=65534, priority=1,in_port=3
actions=resubmit(,4)
duration=67599.526s, table=0, n_packets=273, n_bytes=24999,
idle_age=1741, hard_age=65534, priority=1,in_port=1 actions=resubmit(,1)
n_bytes=2980, idle_age=20799, priority=1,in_port=4 actions=resubmit(,4)
idle_age=65534, hard_age=65534, priority=0 actions=drop
cookie=0x0,
duration=66135.811s, table=1, n_packets=140, n_bytes=13720,
idle_age=65534, hard_age=65534,
priority=1,dl_vlan=1,dl_src=fa:16:3e:66:13:af
actions=mod_dl_src:fa:16:3f:fe:49:e9,resubmit(,2)
idle_age=64081, priority=1,dl_vlan=2,dl_src=fa:16:3e:69:b4:05
actions=mod_dl_src:fa:16:3f:fe:49:e9,resubmit(,2)
idle_age=65301, hard_age=65534,
priority=2,dl_vlan=1,dl_dst=fa:16:3e:66:13:af actions=drop
idle_age=64082, priority=2,dl_vlan=2,dl_dst=fa:16:3e:69:b4:05
actions=drop
idle_age=65534, hard_age=65534,
priority=3,arp,dl_vlan=1,arp_tpa=10.0.1.1 actions=drop
idle_age=63991, priority=3,arp,dl_vlan=2,arp_tpa=10.0.2.1 actions=drop
n_bytes=10687, idle_age=1741, hard_age=65534, priority=0
actions=resubmit(,2)
n_bytes=16981, idle_age=20810, hard_age=65534,
priority=0,dl_dst=00:00:00:00:00:00/01:00:00:00:00:00
actions=resubmit(,20)
n_bytes=7876, idle_age=1741, hard_age=65534,
priority=0,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00
actions=resubmit(,22)
idle_age=64076, priority=2,dl_vlan=2,dl_dst=fa:16:3e:13:55:66
actions=strip_vlan,set_tunnel:0x3eb,output:3
n_bytes=14728, idle_age=65534, hard_age=65534,
priority=2,dl_vlan=1,dl_dst=fa:16:3e:9f:55:67
actions=strip_vlan,set_tunnel:0x3e9,output:3
idle_age=65534, hard_age=65534,
priority=2,dl_vlan=1,dl_dst=fa:16:3e:da:e3:6e
actions=strip_vlan,set_tunnel:0x3e9,output:2
idle_age=64436, priority=2,dl_vlan=1,dl_dst=fa:16:3e:14:b8:ec
actions=strip_vlan,set_tunnel:0x3e9,output:4
duration=64015.308s, table=20, n_packets=0, n_bytes=0, idle_age=64015,
priority=2,dl_vlan=2,dl_dst=fa:16:3e:51:99:b8
actions=strip_vlan,set_tunnel:0x3eb,output:4
n_bytes=917, idle_age=20810,
priority=2,dl_vlan=2,dl_dst=fa:16:3e:bb:cf:66
actions=strip_vlan,set_tunnel:0x3eb,output:3
n_bytes=784, idle_age=65534, hard_age=65534, priority=0
actions=resubmit(,22)
fa:16:3f:fe:49:e9
root@dvr-compute1:~# ovs-vsctl show
67f121bd-cca7-41c2-95ab-23ed85d1305b
Bridge br-tun
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port "vxlan-0ae09f91"
Interface "vxlan-0ae09f91"
type: vxlan
options: {df_default="true", in_key=flow, local_ip="10.224.159.141", out_key=flow, remote_ip="10.224.159.145"}
Port "vxlan-0ae09f88"
Interface "vxlan-0ae09f88"
type: vxlan
options: {df_default="true", in_key=flow, local_ip="10.224.159.141", out_key=flow, remote_ip="10.224.159.136"}
Port br-tun
Interface br-tun
type: internal
OVS会将此包进行VXLAN封装，将L2帧分装到VXLAN中，包头如下：
root@dvr-compute2:~# ovs-ofctl show br-tun
OFPT_FEATURES_REPLY (xid=0x2): dpid:000062e9fb8b8f42
n_tables:254, n_buffers:256
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC
SET_DL_DST SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST
ENQUEUE
1(patch-int): addr:02:dc:f1:96:db:bd
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
3(vxlan-0ae09f88): addr:b6:4b:d0:83:07:52
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
4(vxlan-0ae09f8d): addr:12:e5:36:2c:1a:36
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
LOCAL(br-tun): addr:62:e9:fb:8b:8f:42
config: 0
state: 0
speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
n_bytes=3936, idle_age=22651, hard_age=65534, priority=1,in_port=3
actions=resubmit(,4)
n_bytes=9360, idle_age=22651, hard_age=65534, priority=1,in_port=1
actions=resubmit(,1)
n_bytes=1742, idle_age=3598, hard_age=65534, priority=1,in_port=4
actions=resubmit(,4)
idle_age=65534, hard_age=65534, priority=0 actions=drop
n_bytes=3653, idle_age=22651, hard_age=65534, priority=1,tun_id=0x3eb
actions=mod_vlan_vid:3,resubmit(,9)
n_bytes=2025, idle_age=3598, hard_age=65534, priority=1,tun_id=0x3e9
actions=mod_vlan_vid:2,resubmit(,9)
cookie=0x0,
duration=69453.507s, table=9, n_packets=0, n_bytes=0, idle_age=65534,
hard_age=65534, priority=1,dl_src=fa:16:3f:fe:49:e9 actions=output:1
duration=69453.782s, table=9, n_packets=0, n_bytes=0, idle_age=65534,
hard_age=65534, priority=1,dl_src=fa:16:3f:72:3f:a7 actions=output:1
n_bytes=6028, idle_age=3598, hard_age=65534, priority=0
actions=resubmit(,10)
idle_age=65534, hard_age=65534,
priority=2,in_port=6,dl_src=fa:16:3f:72:3f:a7 actions=resubmit(,1)
duration=70039.627s, table=0, n_packets=0, n_bytes=0, idle_age=65534,
hard_age=65534, priority=2,in_port=6,dl_src=fa:16:3f:fe:49:e9
actions=resubmit(,1)
n_bytes=15954, idle_age=4184, hard_age=65534, priority=1 actions=NORMAL
duration=66458.695s, table=1, n_packets=0, n_bytes=0, idle_age=65534,
hard_age=65534, priority=4,dl_vlan=3,dl_dst=fa:16:3e:51:99:b8
actions=strip_vlan,mod_dl_src:fa:16:3e:69:b4:05,output:12
idle_age=65534, hard_age=65534,
priority=4,dl_vlan=2,dl_dst=fa:16:3e:14:b8:ec
actions=strip_vlan,mod_dl_src:fa:16:3e:66:13:af,output:9
idle_age=65534, hard_age=65534,
priority=2,ip,dl_vlan=2,nw_dst=10.0.1.0/24
actions=strip_vlan,mod_dl_src:fa:16:3e:66:13:af,output:9
idle_age=65534, hard_age=65534,
priority=2,ip,dl_vlan=3,nw_dst=10.0.2.0/24
actions=strip_vlan,mod_dl_src:fa:16:3e:69:b4:05,output:12
fa:16:3e:69:b4:05(MAC of 10.0.2.1 网关地址)
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
32768: from 10.0.1.5 lookup 16
32769: from 10.0.2.3 lookup 16
167772417: from 10.0.1.1/24 lookup 167772417
167772417: from 10.0.1.1/24 lookup 167772417
167772673: from 10.0.2.1/24 lookup 167772673
10.0.1.0/24 dev qr-ddbdc784-d7 proto kernel scope link src 10.0.1.1
10.0.2.0/24 dev qr-001d0ed9-01 proto kernel scope link src 10.0.2.1
169.254.31.28/31 dev rfp-0fbb351e-a proto kernel scope link src 169.254.31.28
default via 169.254.31.29 dev rfp-0fbb351e-a
root@dvr-compute1:~# ip netns exec fip-fbd46644-c70f-4227-a414-862a00cbd1d2 ifconfig
fg-081d537b-06 Link encap:Ethernet HWaddr fa:16:3e:a4:eb:6b
inet addr:172.24.4.6 Bcast:172.24.4.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fea4:eb6b/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:2512 (2.5 KB)
fpr-0fbb351e-a Link encap:Ethernet HWaddr 42:0d:9f:49:63:c6
inet addr:169.254.31.29 Bcast:0.0.0.0 Mask:255.255.255.254
inet6 addr: fe80::400d:9fff:fe49:63c6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1116 (1.1 KB) TX bytes:1116 (1.1 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1250 (1.2 KB) TX bytes:1250 (1.2 KB)
default via 172.24.4.1 dev fg-081d537b-06
169.254.31.28/31 dev fpr-0fbb351e-a proto kernel scope link src 169.254.31.29
172.24.4.0/24 dev fg-081d537b-06 proto kernel scope link src 172.24.4.6
172.24.4.5 via 169.254.31.28 dev fpr-0fbb351e-a
172.24.4.7 via 169.254.31.28 dev fpr-0fbb351e-a
net.ipv4.conf.fg-081d537b-06.proxy_arp = 1
。。。
172.24.4.5 via 169.254.31.28 dev fpr-0fbb351e-a
172.24.4.7 via 169.254.31.28 dev fpr-0fbb351e-a
root@dvr-compute1:~# ip netns exec qrouter-0fbb351e-a65b-4790-a409-8fb219ce16aa ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: rfp-0fbb351e-a: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether ea:5c:56:9a:36:9c brd ff:ff:ff:ff:ff:ff
inet 169.254.31.28/31 scope global rfp-0fbb351e-a
valid_lft forever preferred_lft forever
inet 172.24.4.5/32 brd 172.24.4.5 scope global rfp-0fbb351e-a
valid_lft forever preferred_lft forever
inet 172.24.4.7/32 brd 172.24.4.7 scope global rfp-0fbb351e-a
valid_lft forever preferred_lft forever
inet6 fe80::e85c:56ff:fe9a:369c/64 scope link
valid_lft forever preferred_lft forever
17: qr-ddbdc784-d7: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
link/ether fa:16:3e:66:13:af brd ff:ff:ff:ff:ff:ff
inet 10.0.1.1/24 brd 10.0.1.255 scope global qr-ddbdc784-d7
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fe66:13af/64 scope link
valid_lft forever preferred_lft forever
19: qr-001d0ed9-01: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
link/ether fa:16:3e:69:b4:05 brd ff:ff:ff:ff:ff:ff
inet 10.0.2.1/24 brd 10.0.2.255 scope global qr-001d0ed9-01
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fe69:b405/64 scope link
valid_lft forever preferred_lft forever
10.0.1.0/24 dev qr-ddbdc784-d7 proto kernel scope link src 10.0.1.1
10.0.2.0/24 dev qr-001d0ed9-01 proto kernel scope link src 10.0.2.1
169.254.31.28/31 dev rfp-0fbb351e-a proto kernel scope link src 169.254.31.28
在虚机没有floating ip的情况下，从虚机发出的包会首先到IR，IR中查询路由：
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
32768: from 10.0.1.5 lookup 16
32769: from 10.0.2.3 lookup 16
167772417: from 10.0.1.1/24 lookup 167772417
167772417: from 10.0.1.1/24 lookup 167772417
167772673: from 10.0.2.1/24 lookup 167772673
default via 10.0.1.6 dev qr-ddbdc784-d7
这个表会将其转发给10.0.1.6,而这个IP就是在network node上的router_centralized_snat接口。
stack@dvr-controller:/root$ sudo ip netns exec snat-0fbb351e-a65b-4790-a409-8fb219ce16aa ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
qg-4d15b7f6-cb Link encap:Ethernet HWaddr fa:16:3e:24:0b:6b
inet addr:172.24.4.4 Bcast:172.24.4.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe24:b6b/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:144 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:210 (210.0 B) TX bytes:13320 (13.3 KB)
sg-427653e4-a3 Link encap:Ethernet HWaddr fa:16:3e:9f:55:67
inet addr:10.0.1.6 Bcast:10.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe9f:5567/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:167 errors:0 dropped:0 overruns:0 frame:0
TX packets:52 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16260 (16.2 KB) TX bytes:4460 (4.4 KB)
sg-5df1ec71-d3 Link encap:Ethernet HWaddr fa:16:3e:13:55:66
inet addr:10.0.2.2 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe13:5566/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:34 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3412 (3.4 KB) TX bytes:952 (952.0 B)
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