Can pfsync be used over router or WAN?
swun2010 at gmail.com
Sat May 9 00:54:26 UTC 2009
Establish a IPSEC bewteen this 2 pfsync points is a way to go.
On Sat, May 9, 2009 at 2:44 AM, David DeSimone <fox at verio.net> wrote:
> Sam Wun <swun2010 at gmail.com> wrote:
>> Have anyone tried pfsync over router or WAN?
>> I have read setup guide of CARP+pfsync, the pfsync interface is
>> connected through a crossover cable. Can I connect 2 pfsync
>> interfaces through a router or WAN?
> pfsync(4) talks about this:
> NETWORK SYNCHRONISATION
> States can be synchronised between two or more firewalls using
> this interface, by specifying a synchronisation interface using
> ifconfig(8). For example, the following command sets fxp0 as
> the synchronisation interface:
> # ifconfig pfsync0 syncdev fxp0
> It is important that the underlying synchronisation interface
> is up and has an IP address assigned.
> By default, state change messages are sent out on the
> synchronisation interface using IP multicast packets. The
> protocol is IP protocol 240, PFSYNC, and the multicast group
> used is 184.108.40.206. When a peer address is specified using
> the syncpeer keyword, the peer address is used as a destination
> for the pfsync traffic, and the traffic can then be protected
> using ipsec(4). In such a configuration, the syncdev should
> be set to the enc(4) interface, as this is where the traffic
> arrives when it is decapsulated, e.g.:
> # ifconfig pfsync0 syncpeer 10.0.0.2 syncdev enc0
> It is important that the pfsync traffic be well secured as
> there is no authentication on the protocol and it would be
> trivial to spoof packets which create states, bypassing the
> pf ruleset. Either run the pfsync protocol on a trusted
> network - ideally a network dedicated to pfsync messages such
> as a crossover cable between two firewalls, or specify a peer
> address and protect the traffic with ipsec(4).
> For pfsync to start its operation automatically at the system
> boot time, pfsync_enable and pfsync_syncdev variables should be
> used in rc.conf(5). It is not advisable to set up pfsync with
> common network interface configuration variables of rc.conf(5)
> because pfsync must start after its syncdev, which cannot be
> always ensured in the latter case.
> Syncing over a WAN doesn't seem like it would make sense, offhand.
> Normally you psync between devices that will be able to provide routing
> for a firewalled connection. A device far across a WAN doesn't seem
> like it would be able to provide redundant service. But that's up to
> your design, I suppose.
> Syncing across a LAN could make sense, but you will want to take steps
> to secure the traffic.
> David DeSimone == Network Admin == fox at verio.net
> "I don't like spinach, and I'm glad I don't, because if I
> liked it I'd eat it, and I just hate it." -- Clarence Darrow
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