FreeBSD 5.4 802.1q and linux stalls

[Gleb Smirnoff]

  Meno,

On Fri, Jun 17, 2005 at 12:32:37PM +0100, Meno Abels wrote:
M> i have here a very strange problem which is in real a linux problem
M> but it is triggered by freebsd. I run a lan on which are linux 2.6.8(debian) and
M> freebsd 5.4 systems are connected to a unmanaged gigabit switch. All systems
M> uses this gigabit adapter:
M>  Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet
M> Everything works fine until i do on one freebsd box the following:
M>  ifconfig vlan0 172.20.21.1 netmask 255.255.255.0 vlan 2 vlandev re0
M> i just do this, there is nowhere any configuration for  802.1q  on any other
M> machine on this lan. 
M> What is happen now the freebsd continues to run without any problem, but
M> all linuxs are stopping to understand any arp responses from a freebsd
M> nor an other linux.
M> So they stop to work over the time on this lan anymore. If I do
M> "ifconfig vlan0 unplumb"
M> it takes up to 10 minutes and the linux's are return to the working
M> status as before
M> the ifconfig vlan0... 
M> I didn't not have any clue which network packet could cause these behavior in
M> a linux but there has to be one. Does anybody as any idea?

Try to tcpdump on linux when you create vlan on FreeBSD. Any unusual packet
at this moment?

M> On that lan there is UDP-Broadcast(spread) and multicast traffic(ganglia) 
M> also there are around 120 carp addresses configured on the 10 freebsd boxes.
M> Everything else is standard tcpip/nfs traffic. There is no firewall
M> rules on the interfaces on thes linuxs or the freebsds.

Any routing software? RIP or OSPF?

-- 
Totus tuus, Glebius.
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