#!/bin/sh # Transit A with alpine set -e if [ -z $SNSTERGUARD ] ; then exit 1; fi DIR=`dirname $0` cd `dirname $0` echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories apk update apk add bird iptables rc-update add bird # echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf echo -e '#!/bin/sh\niptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE' > /etc/local.d/iptables.start chmod +x /etc/local.d/iptables.start rc-update add local # keep DHCP on eth0 touch /etc/network/keepdhcp # Force lxc bridged interface metric (else, it grows to 200+interface_index, which can be large with successive stop/start) # This metric must be lower than the one exported by BGP for the default route (static part below) mkdir /etc/udhcpc echo "IF_METRIC=200" > /etc/udhcpc/udhcpc.conf # customize bird config (BGP) sed -i "s/protocol kernel {/protocol kernel { metric 2000;/" /etc/bird.conf # sed -i "s/\#.*export all/\texport all/" /etc/bird/bird.conf echo -e " protocol static { ipv4; route 0.0.0.0/0 via 100.64.0.1; } " >> /etc/bird.conf # Add dnsmasq for external dns apk add dnsmasq rc-update add dnsmasq