# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback
        up ip address add 185.66.193.105/32 dev lo

iface lo inet6 loopback
        up ip address add 2a03:2260:121::105/48 dev lo


# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
        post-up iptables -P OUTPUT ACCEPT
        post-up iptables -A OUTPUT -o eth0 -d 10.0.0.0/8 -j DROP
        post-up iptables -A OUTPUT -o eth0 -d 172.16.0.0/12 -j DROP
        post-up iptables -A OUTPUT -o eth0 -d 169.254.0.0/16 -j DROP
        post-up iptables -A OUTPUT -o eth0 -d 192.168.0.0/16 -j DROP
        post-up iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
auto 6to4
	iface 6to4 inet6 6to4
        local 163.172.27.8

# GRE Tunnel zum Rheinland Backbone
# - Die Konfigurationsdaten werden vom Rheinland Backbone vergeben und zugewiesen

# Berlin Router A
auto gre-bb-a.ak.ber
iface gre-bb-a.ak.ber inet static
        address 100.64.2.151
        netmask 255.255.255.254
        pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.195.0 ttl 255
        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
        post-up ip link set $IFACE mtu 1400
        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-down ip tunnel del $IFACE

iface gre-bb-a.ak.ber inet6 static
        address 2a03:2260:0:155::2/64
        netmask 64
        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312

# Berlin Router B
auto gre-bb-b.ak.ber
iface gre-bb-b.ak.ber inet static
        address 100.64.2.153
        netmask 255.255.255.254
        pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.195.1 ttl 255
        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
        post-up ip link set $IFACE mtu 1400
        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-down ip tunnel del $IFACE

iface gre-bb-b.ak.ber inet6 static
        address 2a03:2260:0:156::2/64
        netmask 64
        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312


# Duesseldorf Router A
auto gre-bb-a.ix.dus
iface gre-bb-a.ix.dus inet static
        address 100.64.2.155
        netmask 255.255.255.254
        pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.193.0 ttl 255
        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
        post-up ip link set $IFACE mtu 1400
        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-down ip tunnel del $IFACE

iface gre-bb-a.ix.dus inet6 static
        address 2a03:2260:0:157::2/64
        netmask 64
        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312


# Duesseldorf Router B
auto gre-bb-b.ix.dus
iface gre-bb-b.ix.dus inet static
        address 100.64.2.157
        netmask 255.255.255.254
        pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.193.1 ttl 255
        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
        post-up ip link set $IFACE mtu 1400
        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
        post-down ip tunnel del $IFACE

iface gre-bb-b.ix.dus inet6 static
        address 2a03:2260:0:158::2/64
        netmask 64
        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312