ipsec and/or netfilter problem
Hi,
I've set up ipsec in my home LAN, it works like a charm except for a little problem.
First, let me explain my network topology. It's a LAN [10.12.0.0/18] with one server [10.12.0.1] and 2 workstations (one desktop [10.12.1.1] and a laptop [10.12.1.2 and 10.12.2.2]).
The server has 3 NIC's: eth0 which is connected to the internet with my cable ISP and br0 (a bridge of eth1 and wlan0) that's connected to the LAN.
The server does SNAT (MASQUERADE) on eth0 to allow the workstations to connect to the Internet.
My goal with ipsec is to secure all the LAN traffic (both ethernet and wireless) so that all traffic is encrypted and authenticated.
The only problem I have is securing the traffic that the workstations send to Internet. I define the following security policy:
At the server:
| spdadd 0.0.0.0/0 10.12.1.1 any -P out ipsec esp/tunnel/10.12.0.1-10.12.1.2/require; | spdadd 10.12.1.1 0.0.0.0/0 any -P in ipsec esp/tunnel/10.12.1.2-10.12.0.1/require;
At the workstation:
| spdadd 10.12.1.1 0.0.0.0/0 any -P out ipsec esp/tunnel/10.12.1.1-10.12.0.1/require; | spdadd 0.0.0.0/0 10.12.1.1 any -P in ipsec esp/tunnel/10.12.0.1-10.12.1.1/require;
It's doing the expected thing: tunnel all traffic from workstations to Internet through ipsec up to the server.
The problem is that the server sends the data to Internet without doing SNAT (checked with tcpdump) (the packets do not traverse the POSTROUTING chain in nat table, checked watching the pkts counters).
These are the rules I've got at the nat table:
| root@server # iptables -vnL -t nat | Chain PREROUTING (policy ACCEPT 132K packets, 7676K bytes) | pkts bytes target prot opt in out source destination | 0 0 DNAT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0 udp spts:1024:65535 dpt:27960 to:10.12.1.1 | 0 0 DNAT udp -- ppp0 * 0.0.0.0/0 0.0.0.0/0 udp spts:1024:65535 dpt:27960 to:10.12.1.1 | | Chain POSTROUTING (policy ACCEPT 12968 packets, 1278K bytes) | pkts bytes target prot opt in out source destination | 2433 147K MASQUERADE all -- * eth0 10.12.0.0/16 0.0.0.0/0 | 0 0 MASQUERADE all -- * ppp0 10.12.0.0/16 0.0.0.0/0 | 0 0 MASQUERADE all -- * br0 10.12.0.0/16 192.168.1.0/24 | | Chain OUTPUT (policy ACCEPT 12736 packets, 1142K bytes) | pkts bytes target prot opt in out source destination
I've tried to use NAT_LOCAL but when I issue the iptables command I get an error:
| root@server # iptables -t nat -A OUTPUT -s 10.12.0.0/16 -o eth0 -j MASQUERADE | iptables: Invalid argument
| root@server # iptables -V
| iptables v1.2.9
| root@server # uname -a
| Linux bacterio 2.6.8-rc2 #1 Mon Jul 26 17:54:31 CEST 2004 i686 GNU/Linux
Kernel config @server is attached.
Anyone has any hint?
If this is not the right list to post this kind of things, where should I ask?
Many thanks in advance
Signature · 1 line
Kiko
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Quoted 10 lines · Kiko Piris
Hi,
I've set up ipsec in my home LAN, it works like a charm except for a little problem.
The problem is that the server sends the data to Internet without doing SNAT (checked with tcpdump) (the packets do not traverse the POSTROUTING chain in nat table, checked watching the pkts counters).
Anyone has any hint?
You could try the netfilter+ipsec patches in netfilter patch-o-matic-ng, they should solve this problem, The current patches only apply to 2.6.6, but I will update them next week
Quoted 3 lines
If this is not the right list to post this kind of things, where should I ask?
Regards
Patrick
[ Please CC me on reply, I'm subscribed to linux-kernel but not to netfilter-devel ]
Quoted 9 lines · Patrick McHardy
Quoted 5 lines · Kiko Piris
The problem is that the server sends the data to Internet without doing SNAT (checked with tcpdump) (the packets do not traverse the POSTROUTING chain in nat table, checked watching the pkts counters).
Anyone has any hint?
You could try the netfilter+ipsec patches in netfilter patch-o-matic-ng, they should solve this problem,
Hi Patrick
I've tried those patches with 2.6.6 and I see the same behaviour, packets do not traverse POSTROUTING chain in nat table (and thus they are not s-natted).
What I did was to manually aply the following patches from patch-o-matic-ng-20040621 to a vanilla 2.6.6 tree:
nf_reset
ipsec-01-output-hooks
ipsec-02-input-hooks
ipsec-03-policy-lookup
ipsec-04-policy-checks
did I miss something? (I understood from your email and from patch-o-matic-ng-20040621/ipsec-*/info files that this was enough, maybe it wasn't... O:-).
Quoted 2 lines
The current patches only apply to 2.6.6, but I will update them next week
I can wait until then, no problem...
Thanks a lot for responding.
Signature · 1 line
Kiko