[Openstack] can anybody help to explain how the packet of ping shoule be forwarded from vm
严超
yanchao727 at gmail.com
Tue Sep 23 07:04:18 UTC 2014
eth0 is virtualized as br100 , as your command show:
2: eth0: mtu 1500 qdisc pfifo_fast *master br100 state UP* qlen 1000
link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
inet6 fe80::21e:67ff:fe6a:8bc9/64 scope link
valid_lft forever preferred_lft forever
So I think packages would be handled by eth0. Right?
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2014-09-23 14:33 GMT+08:00 Sam Lee <lixq2000 at gmail.com>:
> I set up an openstack environment using nova-network with multi_host mode.
>
> created network info as below,
>
> root at ubuntu:~# nova network-show e77b754d-5a89-41fd-8c82-69051e69c4ed
> +---------------------+--------------------------------------+
> | Property | Value |
> +---------------------+--------------------------------------+
> | bridge | br100 |
> | vpn_public_port | None |
> | dhcp_start | 172.16.10.202 |
> | bridge_interface | eth0 |
> | updated_at | None |
> | id | e77b754d-5a89-41fd-8c82-69051e69c4ed |
> | cidr_v6 | None |
> | deleted_at | None |
> | gateway | 172.16.10.1 |
> | rxtx_base | None |
> | label | private |
> | priority | None |
> | project_id | None |
> | vpn_private_address | None |
> | deleted | 0 |
> | vlan | None |
> | broadcast | 172.16.10.207 |
> | netmask | 255.255.255.248 |
> | injected | False |
> | cidr | 172.16.10.200/29 |
> | vpn_public_address | None |
> | multi_host | True |
> | dns2 | None |
> | created_at | 2014-09-11T07:58:13.000000 |
> | host | None |
> | gateway_v6 | None |
> | netmask_v6 | None |
> | dns1 | 8.8.4.4 |
> +---------------------+--------------------------------------+
> Note: 172.16.10.1 is the physical gateway
>
> route info of the host as below：
>
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 0.0.0.0 172.16.10.1 0.0.0.0 UG 100 0 0 eth1
> 10.10.100.0 0.0.0.0 255.255.255.0 U 0 0 0 br100
> 172.16.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
> 172.16.10.200 0.0.0.0 255.255.255.248 U 0 0 0 br100
>
> three instances has been created as below,
>
> root at ubuntu:~# nova list
> +--------------------------------------+-------+--------+-----------------------+
> | ID | Name | Status | Networks |
> +--------------------------------------+-------+--------+-----------------------+
> | 5867fa88-de5c-4656-9811-5c86128b786b | test3 | ACTIVE | private=172.16.10.202 |
> | 272f8d4f-f924-488b-855f-7f53a2372708 | test4 | ACTIVE | private=172.16.10.204 |
> | aec01738-996f-42dc-a921-1c859c79ffed | test5 | ACTIVE | private=172.16.10.205 |
> +--------------------------------------+-------+--------+-----------------------+
>
> ip info of host:
>
> root at ubuntu:~# ip a
> 1: lo: mtu 16436 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> inet 169.254.169.254/32 scope link lo
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: mtu 1500 qdisc pfifo_fast master br100 state UP qlen 1000
> link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::21e:67ff:fe6a:8bc9/64 scope link
> valid_lft forever preferred_lft forever
> 3: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000
> link/ether 00:1e:67:6a:8b:c8 brd ff:ff:ff:ff:ff:ff
> inet 172.16.10.16/24 brd 172.16.10.255 scope global eth1
> inet6 fe80::21e:67ff:fe6a:8bc8/64 scope link
> valid_lft forever preferred_lft forever
> 5: br100: mtu 1500 qdisc noqueue state UP
> link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
> inet 172.16.10.203/29 brd 172.16.10.207 scope global br100
> inet 10.10.100.52/24 brd 10.10.100.255 scope global br100
> inet6 fe80::44c7:b4ff:fe0c:3f/64 scope link
> valid_lft forever preferred_lft forever
> 6: vnet0: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
> link/ether fe:16:3e:0f:03:49 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::fc16:3eff:fe0f:349/64 scope link
> valid_lft forever preferred_lft forever
> 7: vnet1: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
> link/ether fe:16:3e:b3:d8:a1 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::fc16:3eff:feb3:d8a1/64 scope link
> valid_lft forever preferred_lft forever
> 8: vnet2: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
> link/ether fe:16:3e:0e:7a:0d brd ff:ff:ff:ff:ff:ff
> inet6 fe80::fc16:3eff:fe0e:7a0d/64 scope link
> valid_lft forever preferred_lft forever
>
> mac table of br100:
>
> root at ubuntu:~# brctl showmacs br100
> port no mac addr is local? ageing timer
> 1 00:0c:29:27:9d:7e no 16.79
> 1 00:0c:29:27:9d:88 no 5.49
> 1 00:0c:29:58:9a:64 no 31.86
> 1 00:0c:29:f3:cf:7b no 21.28
> 1 00:12:7f:7d:37:a1 no 35.54
> 1 00:14:5e:ac:7c:b5 no 26.20
> 1 00:14:5e:e8:03:d1 no 13.31
> 1 00:14:f2:a8:00:81 no 1.11
> 1 00:1e:67:45:85:ad no 14.02
> 1 00:1e:67:64:ed:c9 no 10.10
> 1 00:1e:67:64:ee:a5 no 9.38
> 1 00:1e:67:6a:8b:c9 yes 0.00
> 1 00:1e:67:97:17:ee no 52.97
> 1 52:54:00:01:40:23 no 10.72
> 1 52:54:00:1c:71:3d no 5.50
> 1 52:54:00:47:9c:ee no 8.70
> 1 52:54:00:b8:aa:45 no 9.79
> 1 52:54:00:ee:60:44 no 7.61
> 1 5c:f3:fc:00:0e:da no 56.27
> 1 5c:f3:fc:00:ad:02 no 1.13
> 1 6c:ae:8b:51:49:12 no 0.64
> 1 8a:62:65:05:8d:02 no 5.38
> 1 ae:2a:9d:74:11:03 no 155.47
> 1 e4:1f:13:75:47:e0 no 8.24
> 1 e4:1f:13:fc:a8:21 no 176.11
> 1 fa:16:3e:00:c8:ce no 0.38
> 1 fa:16:3e:05:61:a3 no 4.29
> 4 fa:16:3e:0e:7a:0d no 11.35
> 2 fa:16:3e:0f:03:49 no 9.90
> 1 fa:16:3e:2c:6c:55 no 24.90
> 1 fa:16:3e:2d:f0:f0 no 7.40
> 1 fa:16:3e:3b:35:e1 no 27.88
> 1 fa:16:3e:3f:1a:0c no 9.18
> 1 fa:16:3e:49:d6:54 no 10.57
> 1 fa:16:3e:4a:47:6e no 13.07
> 1 fa:16:3e:61:d5:0c no 24.14
> 1 fa:16:3e:6b:89:c1 no 25.96
> 1 fa:16:3e:85:80:df no 3.74
> 1 fa:16:3e:8d:a4:da no 28.20
> 1 fa:16:3e:9f:bb:0c no 13.65
> 1 fa:16:3e:a6:88:1d no 24.17
> 3 fa:16:3e:b3:d8:a1 no 6.07
> 1 fa:16:3e:c8:42:0d no 27.80
> 1 fa:16:3e:ca:a8:8e no 4.70
> 1 fa:16:3e:e8:a7:9b no 27.31
> 4 fe:16:3e:0e:7a:0d yes 0.00
> 2 fe:16:3e:0f:03:49 yes 0.00
> 3 fe:16:3e:b3:d8:a1 yes 0.00
>
> arp table of instance test5:
>
> [root at test5 ~]# arp -a
> ? (172.16.10.203) at 00:1e:67:6a:8b:c9 [ether] on eth0
> ? (172.16.10.1) at 00:12:7f:7d:37:a1 [ether] on eth0
>
> route info of instance test5
>
> [root at test5 ~]# route -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 172.16.10.1 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
> 172.16.10.200 0.0.0.0 255.255.255.248 U 1 0 0 eth0
> 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
> 0.0.0.0 172.16.10.1 0.0.0.0 UG 0 0 0 eth0
>
> I ping www.sina.com.cn in instances test5(172.16.10.205)
>
> [root at test5 ~]# ping www.sina.com.cn
> PING ara.sina.com.cn (58.63.236.35) 56(84) bytes of data.
> 64 bytes from 58.63.236.35: icmp_seq=1 ttl=49 time=38.4 ms
> 64 bytes from 58.63.236.35: icmp_seq=2 ttl=49 time=38.5 ms
> 64 bytes from 58.63.236.35: icmp_seq=3 ttl=49 time=38.2 ms
> ^C
> --- ara.sina.com.cn ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2436ms
> rtt min/avg/max/mdev = 38.259/38.427/38.536/0.256 ms
>
> In my option, the packet will go through as follow,
> 1. vm eth0
> 2. br100
> 3. according the mac table of switch br100， the packet will go through to
> port 1
>
> the next step has always puzzled me
> 4. the packet arrived at host eth0. Once the packet arrived eth0, it will
> be processed by iptables chains, INPUT, PREROUTING, kernel routing, OUTPUT
> and so on. the destination address is 58.63.236.35, based on the kernel
> routing table, the packet will be processed by eth1. *In fact, eth0
> processes it.*can anyone explain why??
>
>
>
>
>
> Thanks in advance.
>
>
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