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RE: [Openvpn-users] Strange Warning in log file


  • Subject: RE: [Openvpn-users] Strange Warning in log file
  • From: "Anssi Kolehmainen" <kolean-5.listat@xxxxxxxxxx>
  • Date: Sun, 1 Feb 2004 20:24:00 +0200

> I'm trieing to setup OpenVPN between my linux (server) and windows 
> box.
> The tunnel uses tun on both sides and seperate subnets.
> When i start the VPN on the windows box i get following entries in 
> /var/log/ messages and nothing works (no ping):
> 
> openvpn[7056]: Peer Connection Initiated with 62.xxx.xxx.xxx:8000
> 
> openvpn[7056]: WARNING: Actual Remote Options ('V3,dev-type 
> tun,link-mtu 1542,tun-mtu 1500,proto UDPv4,ifconfig 10.7.0.5 
> 10.7.0.6,comp-lzo,cipher BF-CBC,auth SHA1,keysize
> 128,tls-client') are inconsistent with Expected Remote Options 
> ('V3,dev-type tun,link-mtu 1541,tun-mtu 1500,proto UDPv4,ifconfig 
> 10.7.0.5 10.7.0.6,cipher BF-CBC,auth SHA1,keysize
> 128,tls-client')

Read those actual and expected remote options carefully.

Param       Actual     Expected
            V3         V3
dev-type    tun        tun
link-mtu    1542       1541
tun-mtu     1500       1500
proto       UDPv4      UDPv4
ifconfig    10.7.0.5   10.7.0.5
            10.7.0.6   10.7.0.6
(comp)      comp-lzo   (none)
cipher      BF-CBC     BF-CBC
auth        SHA1       SHA1
keysize     128        128
tls         tls-client tls-client

[Maybe OpenVPN could print it out in this format... It would be definedly
easier to spot differencies]

Two differences: link-mtu and comp-lzo.
Link-mtu probably won't cause anything bad, but if other end compresses data
and other one doesn't then it won't work.

Fix: add comp-lzo to windows box conf file

Anssi Kolehmainen



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