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Re: [Openvpn-users] ICMP blocked.


  • Subject: Re: [Openvpn-users] ICMP blocked.
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Sat, 7 Feb 2004 18:51:18 -0000

Dave,

OpenVPN should work even if ICMP does not.  What will happen is that the ICMP
blockage will break Path MTU discovery.  This is quite common in real-world
OpenVPN installations and the --fragment and --mssfix options were developed
to help work around this.

James


Dave Rocks <daveyboydotcom@xxxxxxxxxxx> said:

> 
> Hello,
> Quick question...would OpenVPN still work if ICMP is blocked between the two 
> machines involved?
> 
> Here's the problem I have. ICMP has been blocked in/out of the routers on my 
> companies WAN.
> This is a global policy I can't change.
> I have a Windows 2000 server at SiteA that must be able to ping a PBX at 
> SiteB.
> 
> So what I'm trying to do is setup a VPN from a test Linux box at SiteA to 
> another at SiteB & route the traffic from the Windows box at SiteA to the 
> PBX at SiteB via this.
> 
> I  have followed various how-to's to get an OpenVPN up but can't. Before I 
> go much further I'd just need to know if what I'm trying is possible or will 
> the lack of ICMP between the sites effect this?
> 
> Many Thanks,
> Dave.
> 
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