networking problems between vms

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Hello,

I'm running 4 virtual machines on one host, connected by a network
bridge on the host (IP 192.168.0.1). All TAP devices get added to that
bridge when starting the vm:

brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.52fd3fbd954e       no              tap01
                                                        tap02
                                                        tap03
                                                        tap04

I use virtio networking (but tried the e1000 driver, too). The vms have
static IPs 192.168.0.250 - 253 with 192.168.0.1 as the gateway.
Connecting from the host to the machines and from the machines to the
internet works just fine. The problem lies in connecting from one
machine to another. There is a 30 seconds delay until the connection
gets established, I tried ssh, http and mysql. After the connection is
there, the speed seems to be normal.

Any hints would be appreciated.

Thanks,
Volker
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