[pptp-server] ProxyArp

[R. de Vroede]

I just fixed a connection problem with PPTP clients reaching the
internal network. To make it work, the options file for pptp has to
contain an entry "proxyarp". 
It is important that you execute:
'echo "1" > /proc/sys/net/ipv4/conf/all/proxy_arp'.
RedHat users can then add 'net.ipv4.conf.all.proxy_arp = 1' to
/etc/sysctl.conf to make it work after rebooting. Others have to add the
'echo "1"...' line to some rc script (say rc.local).
Hope this helps some people.

-- 
Richard de Vroede
(r.devroede at linvision.com)
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