Bridge and iptables postrouting
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2
I have a Linux 3.14 PC with three NICs and a bridge between two of the NICs (eth1 and eth2).
My Question
Why is there no traffic passing through the POSTROUTING rule? FYI, traffic is passing through (forwarded) the bridge just fine. Can someone be kind enough to provide me some pointers to get this working?
ifconfig eth1 down
ifconfig eth2 down
ifconfig eth1 up
ifconfig eth1 0.0.0.0
ifconfig eth2 up
ifconfig eth2 0.0.0.0
brctl addbr sm0
brctl addif sm0 eth1
brctl addif sm0 eth2
ifconfig sm0 up
iptables -t mangle -A POSTROUTING -o eth1 -p all -j CLASSIFY --set-class 1:99
iptables -t mangle -A POSTROUTING -o eth2 -p all -j CLASSIFY --set-class 2:99
Rules
o iptables -t mangle -nvL
Chain PREROUTING (policy ACCEPT 38914 packets, 2954K bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 38210 packets, 2791K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
0 0 CLASSIFY all -- * eth1 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 1:99
0 0 CLASSIFY all -- * eth2 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 2:99
sysctl.conf
net.ipv4.ip_forward=1
Setting the values below to 0 or 1 has no effect on the iptables
net.bridge.bridge-nf-call-arptables=1
net.bridge.bridge-nf-call-ipv6tables=1
net.bridge.bridge-nf-call-ipv4tables=1
networking iptables bridge
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
add a comment |
2
I have a Linux 3.14 PC with three NICs and a bridge between two of the NICs (eth1 and eth2).
My Question
Why is there no traffic passing through the POSTROUTING rule? FYI, traffic is passing through (forwarded) the bridge just fine. Can someone be kind enough to provide me some pointers to get this working?
ifconfig eth1 down
ifconfig eth2 down
ifconfig eth1 up
ifconfig eth1 0.0.0.0
ifconfig eth2 up
ifconfig eth2 0.0.0.0
brctl addbr sm0
brctl addif sm0 eth1
brctl addif sm0 eth2
ifconfig sm0 up
iptables -t mangle -A POSTROUTING -o eth1 -p all -j CLASSIFY --set-class 1:99
iptables -t mangle -A POSTROUTING -o eth2 -p all -j CLASSIFY --set-class 2:99
Rules
o iptables -t mangle -nvL
Chain PREROUTING (policy ACCEPT 38914 packets, 2954K bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 38210 packets, 2791K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
0 0 CLASSIFY all -- * eth1 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 1:99
0 0 CLASSIFY all -- * eth2 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 2:99
sysctl.conf
net.ipv4.ip_forward=1
Setting the values below to 0 or 1 has no effect on the iptables
net.bridge.bridge-nf-call-arptables=1
net.bridge.bridge-nf-call-ipv6tables=1
net.bridge.bridge-nf-call-ipv4tables=1
networking iptables bridge
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
add a comment |
2
2
2
2
I have a Linux 3.14 PC with three NICs and a bridge between two of the NICs (eth1 and eth2).
My Question
Why is there no traffic passing through the POSTROUTING rule? FYI, traffic is passing through (forwarded) the bridge just fine. Can someone be kind enough to provide me some pointers to get this working?
ifconfig eth1 down
ifconfig eth2 down
ifconfig eth1 up
ifconfig eth1 0.0.0.0
ifconfig eth2 up
ifconfig eth2 0.0.0.0
brctl addbr sm0
brctl addif sm0 eth1
brctl addif sm0 eth2
ifconfig sm0 up
iptables -t mangle -A POSTROUTING -o eth1 -p all -j CLASSIFY --set-class 1:99
iptables -t mangle -A POSTROUTING -o eth2 -p all -j CLASSIFY --set-class 2:99
Rules
o iptables -t mangle -nvL
Chain PREROUTING (policy ACCEPT 38914 packets, 2954K bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 38210 packets, 2791K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
0 0 CLASSIFY all -- * eth1 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 1:99
0 0 CLASSIFY all -- * eth2 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 2:99
sysctl.conf
net.ipv4.ip_forward=1
Setting the values below to 0 or 1 has no effect on the iptables
net.bridge.bridge-nf-call-arptables=1
net.bridge.bridge-nf-call-ipv6tables=1
net.bridge.bridge-nf-call-ipv4tables=1
networking iptables bridge
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
I have a Linux 3.14 PC with three NICs and a bridge between two of the NICs (eth1 and eth2).
My Question
Why is there no traffic passing through the POSTROUTING rule? FYI, traffic is passing through (forwarded) the bridge just fine. Can someone be kind enough to provide me some pointers to get this working?
ifconfig eth1 down
ifconfig eth2 down
ifconfig eth1 up
ifconfig eth1 0.0.0.0
ifconfig eth2 up
ifconfig eth2 0.0.0.0
brctl addbr sm0
brctl addif sm0 eth1
brctl addif sm0 eth2
ifconfig sm0 up
iptables -t mangle -A POSTROUTING -o eth1 -p all -j CLASSIFY --set-class 1:99
iptables -t mangle -A POSTROUTING -o eth2 -p all -j CLASSIFY --set-class 2:99
Rules
o iptables -t mangle -nvL
Chain PREROUTING (policy ACCEPT 38914 packets, 2954K bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 38210 packets, 2791K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 38072 packets, 2844K bytes)
pkts bytes target prot opt in out source destination
0 0 CLASSIFY all -- * eth1 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 1:99
0 0 CLASSIFY all -- * eth2 0.0.0.0/0 0.0.0.0/0 CLASSIFY set 2:99
sysctl.conf
net.ipv4.ip_forward=1
Setting the values below to 0 or 1 has no effect on the iptables
net.bridge.bridge-nf-call-arptables=1
net.bridge.bridge-nf-call-ipv6tables=1
net.bridge.bridge-nf-call-ipv4tables=1
networking iptables bridge
networking iptables bridge
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
edited Jul 2 '15 at 14:37
G-Man
13.6k93770
13.6k93770
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
asked Jul 2 '15 at 13:58
AlbertKAlbertK
161
161
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
Your bridge isn't routing traffic, so there's nothing to go through the POSTROUTING rule.
See the netfilter documentation for bridge-netfilter for details and a method to change this configuration (kernel 3.2.0):
modprobe bridge # Enable bridge-netfilter
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Your bridge isn't routing traffic, so there's nothing to go through the POSTROUTING rule.
See the netfilter documentation for bridge-netfilter for details and a method to change this configuration (kernel 3.2.0):
modprobe bridge # Enable bridge-netfilter
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
add a comment |
1
Your bridge isn't routing traffic, so there's nothing to go through the POSTROUTING rule.
See the netfilter documentation for bridge-netfilter for details and a method to change this configuration (kernel 3.2.0):
modprobe bridge # Enable bridge-netfilter
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
add a comment |
1
1
1
Your bridge isn't routing traffic, so there's nothing to go through the POSTROUTING rule.
See the netfilter documentation for bridge-netfilter for details and a method to change this configuration (kernel 3.2.0):
modprobe bridge # Enable bridge-netfilter
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
Your bridge isn't routing traffic, so there's nothing to go through the POSTROUTING rule.
See the netfilter documentation for bridge-netfilter for details and a method to change this configuration (kernel 3.2.0):
modprobe bridge # Enable bridge-netfilter
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
answered Jul 2 '15 at 17:01
roaimaroaima
45.9k758124
45.9k758124
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
add a comment |
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I have the above statement in the system but still no traffic going through the postrouting rule. I am sure that traffic is flowing through the bridge as I am accessing and posting this from the machine attached to the eth2 NIC (LAN facing) of the bridge.
– AlbertK
Jul 3 '15 at 11:01
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
I'm sure you're correct that traffic is flowing through the bridge. What I said was that the bridge isn't routing traffic.
– roaima
Mar 3 at 9:10
add a comment |
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