- kernel version?
- after reboot into OVZ kernel, can you type
# netstat -natp
in the host system please?
- do you use IPv6 at all or it just loaded by RHEL?
- you can turn off IPv6 in /etc/sysconfig/network to test w/o it or if you don't need it at all. Use 'NETWORKING_IPV6=yes|no' parameter.
additional IPv6 info from /etc/sysconfig/network-scripts/ifup-ipv6:
# Uses following information from "/etc/sysconfig/network":
# NETWORKING_IPV6=yes|no: controls IPv6 initialization (global setting)
# IPV6_DEFAULTDEV=<device>: controls default route (optional)
# IPV6_DEFAULTGW=<address>: controls default route (optional)
#
# Uses following information from "/etc/sysconfig/network-scripts/ifcfg-$1":
# IPV6INIT=yes|no: controls IPv6 configuration for this interface
# IPV6ADDR=<IPv6 address>[/<prefix length>]: specify primary static IPv6 address
# IPV6ADDR_SECONDARIES="<IPv6 address>[/<prefix length>] ..." (optional)
# IPV6_ROUTER=yes|no: controls IPv6 autoconfiguration (no: multi-homed interface without routing)
# IPV6_AUTOCONF=yes|no: controls IPv6 autoconfiguration
# defaults:
# IPV6FORWARDING=yes: IPV6_AUTOCONF=no, IPV6_ROUTER=yes
# IPV6FORWARDING=no: IPV6_AUTOCONF=yes
# IPV6_MTU=<MTU for IPv6>: controls IPv6 MTU for this link (optional)