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GRE Tunnel mit dynamischer IP-Adresse - Versionsgeschichte
2026-04-21T19:49:29Z
Versionsgeschichte dieser Seite in Root-Wiki
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https://root-wiki.de/index.php?title=GRE_Tunnel_mit_dynamischer_IP-Adresse&diff=582&oldid=prev
Nevakee am 18. August 2017 um 16:42 Uhr
2017-08-18T16:42:46Z
<p></p>
<p><b>Neue Seite</b></p><div>== "/etc/network/interfaces" == <br />
<br />
auto tun1<br />
iface tun1 inet6 static<br />
address 2001:67c:75c::1<br />
netmask 48<br />
<br />
pre-up ip tunnel add tun1 mode gre remote 123.123.123.123 local 185.37.145.80 ttl 255<br />
post-up /root/gre-updater.sh tun1 example.dyndns.org 185.37.145.80<br />
<br />
<br />
== "/root/gre-updater.sh" == <br />
<br />
#!/bin/bash<br />
<br />
tunnel_if="$1"<br />
tunnel_ext_host="$2"<br />
tunnel_int_host="$3"<br />
<br />
if (( $# == 3 ))<br />
then<br />
tunnel_home_old=`ip tunnel show | grep $tunnel_if | awk '/remote/ {split ($4,A," "); print A[1]}'`<br />
tunnel_home_new=`nslookup $tunnel_ext_host | awk -F ': ' 'NR==6 { print $2 } '`<br />
<br />
if [ ! "$tunnel_home_old" = "$tunnel_home_new" ] ; then<br />
ip tunnel change $tunnel_if mode gre remote $tunnel_home_new local $tunnel_int_host ttl 255<br />
echo "Remote IP updated"<br />
else<br />
echo "Remote IP is correct"<br />
fi<br />
else<br />
echo usage: gre-updater.sh tun1 example.dyndns.org 123.123.123.123<br />
fi<br />
<br />
<br />
== "/etc/crontab" == <br />
<br />
<br />
Prüft alle 5 Minuten, ob die IP-Adresse noch stimmt und passt diese ggf. an.<br />
*/5 * * * * root /root/gre-updater.sh tun1 example.dyndns.org 185.37.145.80 > /dev/null<br />
<br />
[[Kategorie:Software]]</div>
Nevakee