System: CentOS 6.5
Network: Bridge on br0
IPv6: ISP Native /64 block.
IPv4: ISP address (not internal LAN)
Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be assigned to guest OS.
On Host:
/etc/sysctl.conf:
net.ipv4.ip_forward = 1
net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.br0.forwarding = 1
net.ipv6.conf.default.forwarding = 1
brctl show
bridge name bridge id STP enabled interfaces
br0 8000.e840f2ecdfed no eth0
vnet0
virbr0 8000.52540051ef3c yes virbr0-nic
ifconfig:
br0 Link encap:Ethernet HWaddr E8:40:F2:EC:DF:ED
inet addr:xxx.xxx.xxx.xxx Bcast:xxx.xxx.xxx.255 Mask:255.255.255.0
inet6 addr: 2607:beef:be:beef::1/64 Scope:Global
inet6 addr: fe80::ea40:f2ff:feec:dfed/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:365707 errors:0 dropped:0 overruns:0 frame:0
TX packets:470458 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:28867567 (27.5 MiB) TX bytes:574512176 (547.8 MiB)
eth0 Link encap:Ethernet HWaddr E8:40:F2:EC:DF:ED
inet6 addr: fe80::ea40:f2ff:feec:dfed/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:392675 errors:0 dropped:0 overruns:0 frame:0
TX packets:608319 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:46359514 (44.2 MiB) TX bytes:586262036 (559.1 MiB)
Interrupt:20 Memory:fe500000-fe520000
/etc/sysconfig/networt-scripts/ifcfg-br0:
DEVICE=br0
BOOTPROTO=static
IPADDR=xxx.xxx.xxx.xxx
NETMASK=255.255.255.0
ONBOOT=yes
GATEWAY=xxx.xxx.xxx.xxx
IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6ADDR=2607:beef:be:beef::1/64
TYPE=Bridge
DELAY=0
cat /etc/sysconfig/network-scripts/route6-br0
2607:beef:be:bff:ff:ff:ff:ff dev br0
default via 2607:beef:be:bff:ff:ff:ff:ff
route -A inet6 -n
Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
2607:beef:be:beef::/64 :: U 256 0 0 br0
2607:beef:be:bff:ff:ff:ff:ff/128 :: U 1024 1 0 br0
fe80::/64 :: U 256 0 0 virbr0
fe80::/64 :: U 256 0 0 vnet0
fe80::/64 :: U 256 0 0 br0
fe80::/64 :: U 256 0 0 eth0
::/0 2607:beef:be:bff:ff:ff:ff:ff UG 1024 20281 4 br0
::1/128 :: U 0 1 1 lo
2607:beef:be:beef::/128 :: U 0 0 1 lo
2607:beef:be:beef::1/128 :: U 0 36128 1 lo
...
ip6tables -S:
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p ipv6-icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8888 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp6-adm-prohibited
-A FORWARD -s 2607:beef:be:beef::/64 -i br0 -j ACCEPT
On Guest:
OS: CentOS 6.5 minimal
Network: Manual
cat /etc/sysconfig/network-scripts/ifcfg-eth0:
ONBOOT=yes
NM_CONTROLLED=no
IPV6INIT=yes
IPV6ADDR=2607:beef:be:beef::2/64
IPV6_DEFAULTGW=2607:beef:be:beef::1 (The host's ipv6 address)
Behaviour:
On Host, I can ping guest's ipv6 address, vise-vesa.
I cannot ping any other ipv6 address from guest, including google dns 2001:4860:4860::8888/8844. (Timed out)
I cannot ping from any non-assigned ISP ipv6 address to guest. (Timed out)
ping6 from Hosts to outside is OK.
Update:
- If I change Guest's gateway to 2607:beef:be:bff:ff:ff:ff:ff (Host's gateway), the guest will complain "no route to host". Even I added the static route info (route6-eth0) to the Guest, it still won't connect.
Could anyone help me figure out what is going on please? Thanks.