Quoting Dag Wieers <dag@xxxxxxxxxx>:
Hi,
Does anyone have experience using IPSEC on CentOS in order to connect to
vendor IPSEC-based VPN products (specifically Checkpoint FW1) ?
Is the included IPSEC implementation sufficient, or do people have to rely
on OpenSWAN or FreeSWAN ? I'd be testing tomorrow and I'm interested with
experiences others have had and things to look out for.
Depends on what you want to do.
The IPSec implementation in default kernel just works. On its own.
Some things might not be really intuitive to figure out (such as
routing wich is now affected by both routing table and IPSec policy,
and the IPSec tunnels do not have virtual interfaces).
If you want to use only IPSec, the default config files in
/etc/sysconfig/network-scripts should do the job for most network
configs. If you have something exotic, you might need to script a bit
yourself.
If the other side uses GRE inside IPSec (seems to be common setup on
Cisco routers that also run BGP), you'll need to script a bit
yourself. 2.6 kernels do both GRE and IPSec, and the combination of
two nicely. However, there are no provisions for GRE in initscripts
(check Linux Advanced Routing HOWTOs on how to use "ip tunnel" command
to setup GRE).
However, do note that there are some unsolved bugs in Netfilter that
affect IPSec traffic. So if you want to have both firewall and IPSec
on the same machine, there's couple of things to watch out. They will
never be fixed in CentOS4/RHEL4 since fixing them would break kernel
ABI, That's response I got from RH, see these bugzillas:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=165359
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=143374
Also, if you want to combine GRE with IPSec with Netfilter, you'd need
to configure IPSec in tunnel mode (common setup for GRE inside IPSec
is transport mode, since GRE is already handling tunneling). The bugs
in Netfilter just get more severe when using transport mode.
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