ping send to problem, what am i missing

[Aaron Martinez]

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