Dobrica Pavlinušić's random unstructured stuff

IP over DNS: Revision 5

I guess that you "already know everything about this"<http://thomer.com/howtos/nstx.html>. However, here is a list of changes specific to me:

* I wanted everything to be automatic: just `/etc/init.d/nstxcd start` and I *should* be ready to go
* I use dnsmasq for local DNS proxy (with cacheing) so my configuration use `/etc/resolv.conf-upstream`

^ Server setup

More or less standard, expect for fact that my DNS server has multiple IP addresses and I *do* want to run `bind` on some of them. So I added something like:

.pre
# /etc/bind/named.conf
options {
listen-on {
1.2.3.4;
}
}
.pre

Configuring `nstx` is straightforward:

.pre
# /etc/default/nstx
NSTX_DOMAIN="tunnel.example.com"
start_nstxd=yes
ifup_tun=tun0
NSTX_IFACE="1.2.3.4"
.pre

Rest of the setup is same as in "original instructions"<http://thomer.com/howtos/nstx.html>.

^ Client setup

Here comes the fun part.

.pre
# /etc/network/interfaces
iface tun0 inet static
address 10.0.0.2
netmask 255.0.0.0
mtu 500 # optional, may solve ssh problems
post-up route add -host `grep nameserver /etc/resolv.conf-upstream |head -1|awk '{print $2}'` gw `netstat -rn | grep ^0.0.0.0 | awk '{ print $2 }'` ; route del default ; route add -net default gw 10.0.0.1
post-down dhclient
.pre

`post-up` part is modified so that DNS server doesn't have to be in same network segment as my IP address (as it often isn't).

.pre
# /etc/default/nstx
NSTX_DOMAIN="tunnel.example.com"
NSTX_DNS_SERVER=`grep nameserver /etc/resolv.conf-upstream |head -1|awk '{print $2}'`
start_nstxcd=yes
ifup_tun=tun0
.pre

Since I don't want to start `nstxcd` on each startup (because I don't need it always) I did:

.pre
sudo update-rc.d -f nstx remove
sudo update-rc.d -f nstxc remove
.pre

With this, I can get IP address and just do `/etc/init.d/nstxcd start` and I'm ready to go...