EdgeOS - Clean up useless IPv6 addresses after PPPoE is down/reconnected (/etc/ppp/ip-down.d)

remove_invalidv6.sh

#!/bin/sh

/sbin/ifconfig switch0 | grep -ivE 'fe80' | grep 'inet6' | awk '{print $3}' | while read -r ipv6addr ; do
    echo "Removing $ipv6addr from switch0" >> /tmp/ipv6_remove.log
    /sbin/ip -6 addr del $ipv6addr dev switch0
done
/etc/init.d/radvd restart

{print $3} seems to need to be {print $2} now. Maybe ifconfig has changed. (I'm using firmware 2.0.9hf7)

I prefer search of 'global' over search for not 'fe80'. So it becomes:

#!/bin/sh

/sbin/ifconfig switch0 | grep 'inet6' | grep 'global' | awk '{print $2}' | while read -r ipv6addr ; do
    echo "Removing $ipv6addr from switch0" >> /tmp/ipv6_remove.log
    /sbin/ip -6 addr del $ipv6addr dev switch0
done
/etc/init.d/radvd restart

Here is a tiny script that can be placed in /config/scripts/firstboot.d which will re-add a print DeprecatePrefix on; to /opt/vyatta/sbin/vyatta_gen_radvd.pl immediately after a firmware update, assuming the firmware update hasn't drastically changed the way the original works. Just put it in a file such as fix.sh and make it executable.

#!/bin/sh
sed -i '/print $FD_WR "    prefix $prefix {\\n";/, +8 s/print $FD_WR "    };\\n";/print $FD_WR "        DeprecatePrefix on;\\n    };\\n";/g' /opt/vyatta/sbin/vyatta_gen_radvd.pl
exit 0

It doesn't matter if it accidentally gets run more than once during testing, it only changes the file once.

Note: It doesn't add another print statement, instead it just modifies the existing print statement. Don't run it if you've already added another print statement.