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Re: Network down [message #39144 is a reply to message #39100] Fri, 19 March 2010 13:24 Go to previous messageGo to previous message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Hello,

if I'm not mistaken you wrote to OpenVZ users mailing list about the same problem. I answered it several days ago so I was hoping that you have to receive an answer. Anyway, here was the answer

Quote:

Hi,

as far as I understand, your network configuration is based on simple
venet0 interface.
Is that true? I suppose that you are faced with arp-problem but could
you please elaborate
your network configuration a little bit so one can understand what the
exact environment is.
It may be important if you are using several route tables.
"ip a l", "ip route list table all", "ip rule list", "arp -n" would be
enough I suppose.

Let me give you a hint so that you will be able to cope with the problem
by yourself.
venet0 is working according the following principle. If a remote machine
is willing to communicate
with a VE it send "arp-who has" request. This type of request reaches a
HN and the HN is sending
"arp reply" to the remote machine (that's why "arp -n" output should
contain information about VE).
Then the remote machine sends network packets to the HN but because of
the additional route
(see "ip route list" output) all packets are going inside VE through the
HN. That's the principle of venet0
interface.

To catch the problem I recommend you using "tcpdump" utility.

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