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Am Donnerstag, 10. Dezember 2015, 14:01:33 schrieb Michael Schwartzkopff:
> Hi,
>
> For a test I set up a LVS that should balance a telnet service inside a
> LAN.
>
> So the client IP ist 192.168.0.1
> the virtual IP is 192.168.0.2
>
> and the real servers IPs are 192.168.0.3 and 4.
>
> I prepared my loadbalancer:
> echo "1" > /proc/sys/net/ip4/ip_forward
> echo "1" > /proc/sys/net/ipv4/vs/conntrack
>
> and added:
>
> iptables -t nat -I POSTROUTING -p tcp -s 192.168.0.0/24 -d 192.168.0.3 \
> --destination-port=23 -j MASQUERADE
> iptables -t nat -I POSTROUTING -p tcp -s 192.168.0.0/24 -d 192.168.0.4 \
> --destination-port=23 -j MASQUERADE
>
> the ipvs config is:
>
> ipvsadm -A -t 192.168.0.2:23 -s rr
> ipvsadm -a -t 192.168.0.2:23 -r 192.168.0.3:23 -m -w 1
> ipvsadm -a -t 192.168.0.2:23 -r 192.168.0.4:23 -m -w 1
>
> Now a strange thing happens. A telnet fron the client does NOT work
>
> # telnet 192.168.0.2
>
> UNTIL I start tcpdump on the loadbalacer. When I watch the traffic
> everything works. I do not watch, telnet fails. The behavoiur is absolutely
> reproducable.
>
> Oh, the interface of my loadbalancer ist a bridge br0 over the single
> interface eth0.
>
> Did anybody implement some quantum computing in the ipvs module?
> Anybody has a explanation for that behaviour?
Solved: When I remove the bridge and use the plain eth0 interface everything
works as expected.
Any idea why the bridged setup only works when watching?
Mit freundlichen Grüßen,
Michael Schwartzkopff
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