Date: Tue, 3 Jun 2008 16:37:59 +0300 From: Nikos Vassiliadis <nvass@teledomenet.gr> To: freebsd-questions@freebsd.org Cc: alexus <alexus@gmail.com> Subject: Re: VPN (IPSEC) Message-ID: <200806031638.00027.nvass@teledomenet.gr> In-Reply-To: <6ae50c2d0805311649p14863af3y43af39fb4aa2cc8a@mail.gmail.com> References: <6ae50c2d0805311649p14863af3y43af39fb4aa2cc8a@mail.gmail.com>
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On Sunday 01 June 2008 02:49:22 alexus wrote: > Hello, > > I'm trying to establish a VPN tunnel over internet, I read a > http://www.freebsd.org/doc/en/books/handbook/ipsec.html on how to set > it up, I'm some what strangeling if my setup will work at all. > > i have box #1 that have 1 primary IP, which is private IP but in front > of my box, I have a device that translate a public IP address into > private IP, so "technicaly" its a public IP not a private, yet system > sees it as private, yet my box #2 has interface with real public ip > and another interface with private ip, i created GIF0 interface, yet i > can't ping private range on other box. > > > box#1 > > fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu > 1500 options=8<VLAN_MTU> > ether 00:0f:fe:aa:f4:61 > inet 192.168.1.251 netmask 0xffffff00 broadcast 192.168.1.255 > inet 172.16.172.16 netmask 0xffffffff broadcast 172.16.172.16 > media: Ethernet autoselect (100baseTX <full-duplex>) > status: active > plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST,NEEDSGIANT> metric 0 > mtu 1500 lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu > 16384 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 > inet6 ::1 prefixlen 128 > inet 127.0.0.1 netmask 0xff000000 > gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280 > tunnel inet 38.96.123.42 --> 74.2.252.194 > inet 192.168.1.251 --> 192.168.2.252 netmask 0xffffffff You said that the router in front of box#1 is willing to NAT your rfc1918 address to a "public" one. Yet, you seem to have configured gif0 with your exterior peer address 38.96.123.42, which is not your address, but seems like the "public" one. Example configuration: box#1 ifconfig fxp0 1.1.1.1 box#2 ifconfig fxp0 2.2.2.2 ## let's set up the endpoints of tunnel box#1 ifconfig gif0 tunnel 1.1.1.1 2.2.2.2 box#2 ifconfig gif0 tunnel 2.2.2.2 1.1.1.1 ## let's set up the interior addresses box#1 ifconfig gif0 10.234.78.1 10.234.78.2 netmask 255.255.255.255 box#2 ifconfig gif0 10.234.78.2 10.234.78.1 netmask 255.255.255.255 You should be able to ping remote peer addresses at this time. box#1 ping 10.234.78.2 Set up some routes and it will be fine. Nevertheless, in case it doesn't be sure that the NAT device: 1) is willing to NAT IPIP and 2) will do 1:1 NAT HTH, Nikos
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