[vpn-help] Using Shrew Soft VPN with Slackware Linux

[andy thomas]

I have successfully built & installed the Shrew Soft VPN client 2.1.7 from 
source for a 32-bit Slackware 13.37 system and using a VPN configuration 
that is known to work for Windows XP, I'm able to make a connection to the 
remote network. The tap0 interface comes up using the correct static IP 
address for the remote network and the routing tables appear to be correct 
but I cannot connect to or ping anything on the remote network.

Reading the Shrew Soft VPN Linux installation document under the section 
headed 'Configure OS' on page 4, it mentions using a text editor to modify 
/etc/sysctl.conf. There is no such file in or sysctl utility in Slackware 
Linux, where kernel parameters are modified through /proc filesystem with 
commands like this example:

 	echo 1 > /proc/sys/net/ipv4/ip_forward

Can anyone confirm that correct Slackware equivalent settings would look 
like this:

cdandy at purdy:~$ cat /proc/sys/net/ipv4/conf/all/rp_filter
0
andy at purdy:~$ cat /proc/sys/net/ipv4/conf/default/rp_filter
0
andy at purdy:~$ cat /proc/sys/net/ipv4/conf/lo/rp_filter
0
andy at purdy:~$ cat /proc/sys/net/ipv4/conf/eth0/rp_filter
0

Finally, the iked log is reporting:

andy at purdy:/var/log$ cat iked.log
12/07/03 01:11:18 ## : IKE Daemon, ver 2.1.7
12/07/03 01:11:18 ## : Copyright 2010 Shrew Soft Inc.
12/07/03 01:11:18 ## : This product linked OpenSSL 0.9.8r 8 Feb 2011
12/07/03 01:11:31 K! : recv X_SPDADD message failure ( errno = 17 )
12/07/03 01:11:31 K! : recv X_SPDADD message failure ( errno = 17 )

What does this mean?

Thanks in advance for any help,

Andy