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xenserver: Enable ARP filtering to work around xhad bug.

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This works around a bug in xhad, which binds to a particular Ethernet
device, which in turn causes ICMP port unreachable messages if packets are
received are on the wrong interface, which in turn can happen if we send
out ARP replies on every interface (as Linux does by default) instead of
just on the interface that has the IP address being ARPed for, which this
sysctl setting in turn works around.

Justin Pettit did most of the work tracking down the origin of this bug.

Bug #1378.
This commit is contained in:
Ben Pfaff 2009-07-28 15:44:58 -07:00
parent 3cdc31a4c3
commit aa80fd55a1
1 changed files with 15 additions and 0 deletions
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15
xenserver/vswitch-xen.spec
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@ -167,6 +167,21 @@ fi
%post
source /etc/xensource-inventory
if grep -F net.ipv4.conf.all.arp_filter /etc/sysctl.conf >/dev/null 2>&1; then :; else
cat >>/etc/sysctl.conf <<EOF
# This works around an issue in xhad, which binds to a particular
# Ethernet device, which in turn causes ICMP port unreachable messages
# if packets are received are on the wrong interface, which in turn
# can happen if we send out ARP replies on every interface (as Linux
# does by default) instead of just on the interface that has the IP
# address being ARPed for, which this sysctl setting in turn works
# around.
#
# Bug #1378.
net.ipv4.conf.all.arp_filter = 1
EOF
fi
xe host-param-set \
"other-config:vSwitchVersion=%{version}" uuid="$INSTALLATION_UUID" ||
echo "Could not set vSwitchVersion config parameter"