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Date:      Mon, 20 Nov 2006 10:49:36 -0600
From:      Lane <lane@joeandlane.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: ping send to problem, what am i missing
Message-ID:  <200611201049.36275.lane@joeandlane.com>
In-Reply-To: <4561D4A6.10702@proficuous.com>
References:  <4561D4A6.10702@proficuous.com>

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On Monday 20 November 2006 10:15, Aaron Martinez wrote:
> I'm trying to get some routing working from my freebsd 6.1 machine that
> i thought should be extremely easy, but not having any luck.  When
> trying to ping the destination address (192.168.5.6) i get : "ping:
> sendto: Invalid argument"
>
> the net goes like so:   freebsd6.1----linux router-----another linux
> router---openbsd machine (running openvpn)
>
> the corresponding routing tables are as such:
>
> freebsd6.1:
> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif Expire
> default            192.168.3.94       UGS         1   121441   fxp0
> 127.0.0.1          127.0.0.1          UH          0        0    lo0
> 192.168.3.64/27    link#1             UC          0        0   fxp0
> 192.168.3.94       00:40:f4:76:3d:d3  UHLW        2   106622   fxp0   1154
> 192.168.4.1/32     192.168.4.5        UGS         0     2042   tun0
> 192.168.4.5        192.168.4.6        UH          1        0   tun0
> 192.168.5          192.168.0.66       UGS         0      154   fxp0
>
>
> I manually added the 192.168.5 route using the following command (please
> correct me if i did it incorrectly
>
> route -n add 192.168.5/24 192.168.0.66
>
>
> first linux router:
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> 192.168.3.32    0.0.0.0         255.255.255.224 U        40 0          0
> eth0
> 192.168.3.96    0.0.0.0         255.255.255.224 U        40 0          0
> eth2
> 192.168.3.64    0.0.0.0         255.255.255.224 U        40 0          0
> eth1
> 192.168.3.160   0.0.0.0         255.255.255.224 U        40 0          0
> eth4
> 192.168.3.128   0.0.0.0         255.255.255.224 U        40 0          0
> eth3
> 0.0.0.0         192.168.3.62    0.0.0.0         UG       40 0          0
> eth0
>
>
> second linux router:
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> 192.168.3.32    0.0.0.0         255.255.255.224 U        40 0          0
> eth3
> 192.168.3.96    192.168.3.34    255.255.255.224 UG       40 0          0
> eth3
> 192.168.3.64    192.168.3.34    255.255.255.224 UG       40 0          0
> eth3
> 192.168.3.160   192.168.3.34    255.255.255.224 UG       40 0          0
> eth3
> 192.168.3.128   192.168.3.34    255.255.255.224 UG       40 0          0
> eth3
> 192.168.2.0     0.0.0.0         255.255.255.0   U        40 0          0
> eth2
> 192.168.1.0     0.0.0.0         255.255.255.0   U        40 0          0
> eth1
> 192.168.0.0     0.0.0.0         255.255.255.0   U        40 0          0
> eth0
> 0.0.0.0         0.0.0.0         0.0.0.0         U        40 0          0
> dsl1
>
>
> openbsd machine:
> Routing tables
>
> Internet:
> Destination        Gateway            Flags    Refs      Use    Mtu
> Interface
> default            192.168.0.254      UGS         5   516934      -   rl0
> 127/8              127.0.0.1          UGRS        0        0  33224   lo0
> 127.0.0.1          127.0.0.1          UH          1      125  33224   lo0
> 192.168.0/24       link#1             UC          2        0      -   rl0
> 192.168.0.2        00:d0:b7:8f:51:41  UHLc        0        5      -   rl0
> 192.168.0.254      00:e0:18:90:17:f1  UHLc        1        0      -   rl0
> 192.168.4/24       192.168.4.2        UGS         0     2042      -   tun0
> 192.168.4.2        192.168.4.1        UH          1        0      -   tun0
> 192.168.5/24       192.168.5.2        UGS         0     3411      -   tun1
> 192.168.5.2        192.168.5.1        UH          1        5      -   tun1
> 224/4              127.0.0.1          URS         0        0  33224   lo0
>
>
> i can successfully ping the 192.168.0.66 host with no problems, so i'm
> guessing that most of my routes are fine, i am a little suspect however
> about the route i manually put in.  I can also ping the 192.168.5.6
> address FROM the openbsd machine.  All firewalls between these machines
> ARE disabled.   i DO have ip forwarding enabled on the OPENBSD machine:
> # sysctl -a | grep
> forward
>
> net.inet.ip.forwarding=1
>
>
> I can't figure what's going on here any help would be terribly
> appreciated.  Any more info that is needed just ask.
>
> thanks in advance,
>
> Aaron
>
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Aaron,

It looks like the FreeBSD and the OpenBSD machines are vpn tunnelling through 
the linux routers, right?

If that is the case then you really shouldn't have to mess around with manual 
routing tables, at all.  You should be looking at the OpenVPN configuration.

If I was working on this problem, I'd first shut down openvpn and verify that 
FreeBSD and OpenBSD can talk along their default routes (it looks like they 
each have only one nic, so the default routes will be used).

Next, after I am able to verify clear communication from both sides, I'd start 
working on the OpenVPN configuration.  When configured correctly the openvpn 
server will push an appropriate route to the client, and presto!  VPN.

lane



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