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Hi,
I am unable to get TFTP to continue to work after activating LVS on a
kernel that is 3.8.x or newer.
Oh, and before you ask... this is not an ARP problem ;-)
Im my current setup I have a PXE Boot Server running Scientific Linux
7.1 with LVS on a 3.10.x kernel. LVS distributes traffic for port 25 to
some PXE booted nodes. This all runs fine with older kernels and kernel
3.6.10 was my last successful version used. I have two interfaces on the
server, one for LVS listening for traffic for port 25, and a 2nd
interface just for PXE booting and the LVS to send traffic to the real
servers.
LVS is not broken, but it breaks TFTP and drops UDP packets leaving the
server once activated but ONLY in kernels 3.8.x or newer.
To test, setup a PXE server and follow these steps.
1. boot server with selinux disabled and no iptables or ipvsadm rules in
place.
-- test boot PXE node = OK
2. iptables -t mangle -A PREROUTING -i enp0s8 -p tcp -s 0/0 -d
192.168.0.253 --dport smtp -j MARK --set-mark 1
-- test boot PXE node = OK
3. ipvsadm -A -f 1 -s rr
-- test boot PXE node = FAIL
4. reboot to restore pxe boot service.
Now, if you boot a PXE node during each step above, you will notice that
at step 3 your PXE nodes will start failing to boot and you need to
reboot your PXE server to restore PXE boot service.
I currently have this working fine in Scientific Linux 6 running a
2.6.32 kernel, but kernels newer than 3.6.10 all seem to have this a
problem ;-(
I did raise a bug a while back with RedHat as I was testing with Fedora
at the time but it got ignored -
https://bugzilla.redhat.com/show_bug.cgi?id=988941
Is this a known bug/limitation of LVS?
Thanks,
Richard
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