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Re: [lwip-users] Virtual machines in the same host (bridge).


From: Norberto R. de Goes Jr.
Subject: Re: [lwip-users] Virtual machines in the same host (bridge).
Date: Fri, 30 Jan 2015 09:35:21 -0200

Sylvain:
in fact, the lwip mask was outside range, it was "255.255.255.0". Then I replaced it by "255.255.0.0". The lwip address configuration (updated):
  - gw:      169.254.6.1
  - ip:        169.254.6.2
  -mask:   255.255.0.0

Reboot the two machine, setup the VM#1 bridge, etc. 
But the problem was not solved... No ping reply still.

Below the traces reports (on VM#1) :

>>>>> tcpdump br0:
address@hidden norberto]# tcpdump -i br0 -v
tcpdump: listening on br0, link-type EN10MB (Ethernet), capture size 65535 bytes
09:29:19.439073 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
09:29:21.439670 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
09:29:22.439580 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
09:29:23.442344 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
...

>>>>> tcpdump tap0:
address@hidden norberto]# tcpdump -i tap0 -v
tcpdump: WARNING: tap0: no IPv4 address assigned
tcpdump: listening on tap0, link-type EN10MB (Ethernet), capture size 65535 bytes
09:30:18.473570 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
09:30:18.474639 ARP, Ethernet (len 6), IPv4 (len 4), Reply 169.254.6.2 is-at 01:02:03:04:05:06 (oui Unknown), length 46
09:30:19.476042 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 169.254.6.2 tell 169.254.4.39, length 46
09:30:19.476560 ARP, Ethernet (len 6), IPv4 (len 4), Reply 169.254.6.2 is-at 01:02:03:04:05:06 (oui Unknown), length 46
...

>>>>> lwip console:
...
tcpip_thread: PACKET 0x3bd754
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:08:00:27:a8:38:00, type:806
etharp_update_arp_entry: 169.254.4.39 - 08:00:27:a8:38:00
etharp_find_entry: found matching entry 0
etharp_update_arp_entry: updating stable entry 0
etharp_arp_input: incoming ARP request
etharp_arp_input: replying to ARP request for our IP address
tcpip_thread: PACKET 0x3bd754
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:08:00:27:a8:38:00, type:806
etharp_update_arp_entry: 169.254.4.39 - 08:00:27:a8:38:00
etharp_find_entry: found matching entry 0
etharp_update_arp_entry: updating stable entry 0
etharp_arp_input: incoming ARP request
etharp_arp_input: replying to ARP request for our IP address
tcpip_thread: PACKET 0x3bd754
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:08:00:27:a8:38:00, type:806
etharp_update_arp_entry: 169.254.4.39 - 08:00:27:a8:38:00
etharp_find_entry: found matching entry 0
etharp_update_arp_entry: updating stable entry 0
etharp_arp_input: incoming ARP request
etharp_arp_input: replying to ARP request for our IP address
...


Thanks!
Norberto


2015-01-30 8:43 GMT-02:00 Sylvain Rochet <address@hidden>:
Hi,

On Fri, Jan 30, 2015 at 08:28:20AM -0200, Norberto R. de Goes Jr. wrote:
> Hello Sylvain.
> Below the information asked by you. Thanks in advance!
> Norberto
>
>
> >>>>>>>>>> VM#1 (with lwip app):
>
> address@hidden norberto]# brctl show
> bridge name bridge id STP enabled interfaces
> br0 8000.080027c07dab no p2p1
> tap0

Looks good.


> address@hidden norberto]#
> address@hidden norberto]# ip a s
> 1: lo: <LOOPBACK,UP,LOWER_UP> 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
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: p2p1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast master br0 state UP qlen 1000
>     link/ether 08:00:27:c0:7d:ab brd ff:ff:ff:ff:ff:ff
>     inet6 fe80::a00:27ff:fec0:7dab/64 scope link
>        valid_lft forever preferred_lft forever

UP ok.


> 4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
>     link/ether 08:00:27:c0:7d:ab brd ff:ff:ff:ff:ff:ff
>     inet 169.254.8.218/16 brd 169.254.255.255 scope global br0
>     inet6 fe80::7084:1aff:fe21:998f/64 scope link
>        valid_lft forever preferred_lft forever

UP ok.

> 5: tap0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast master br0 state UNKNOWN qlen 500
>     link/ether 8e:f4:c4:a8:9a:c8 brd ff:ff:ff:ff:ff:ff
>     inet6 fe80::8cf4:c4ff:fea8:9ac8/64 scope link
>        valid_lft forever preferred_lft forever

UP ok.

Note you need to use something inside 169.254.0.0/16 in lwIP as well and
please check the netmask is fine on the lwIP stack. I am not sure it is
not actually enforced to something like /24.


> address@hidden norberto]#
> address@hidden norberto]# ip r s
> 169.254.0.0/16 dev br0  proto kernel  scope link  src 169.254.8.218
> address@hidden norberto]#
>
> >>>>>>>>>> VM#2 (ping executor):
>
> address@hidden norberto]# brctl show
> bridge name bridge id STP enabled interfaces
> address@hidden norberto]#
> address@hidden norberto]# ip a s
> 1: lo: <LOOPBACK,UP,LOWER_UP> 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
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: p2p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
> UP qlen 1000
>     link/ether 08:00:27:a8:38:00 brd ff:ff:ff:ff:ff:ff
>     inet 169.254.4.39/16 brd 169.254.255.255 scope global p2p1
>     inet6 fe80::a00:27ff:fea8:3800/64 scope link
>        valid_lft forever preferred_lft forever

UP ok.


> address@hidden norberto]#
> address@hidden norberto]# ip r s
> 169.254.0.0/16 dev p2p1  proto kernel  scope link  src 169.254.4.39
> 224.0.0.0/4 dev p2p1  proto static
> address@hidden norberto]#

It should work if fedora2.p2p1 and fedora.p2p1 are properly bridged on
host, check the lwIP netmask then tcpdump's your friend :)


Sylvain

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--
Norberto R. de Goes Jr.
CPqD - DRC
Tel.: +55 19 3705-4241 / Fax: +55 19 3705-6125
address@hidden
www.cpqd.com.br



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