Get ipv6 working with the default eap_proxy interfaces on EdgeOS

eap_proxy_edgeos_ipv6.sh

#!/bin/sh

PREAMBLE="\x19\x00\x00\x02\x00\x00\x0d\xe9\x30\x30\x44\x30\x39\x45\x2d" # For Pace 5268AC
SERIAL=00000A000000
WAN=eth0.0
LAN=eth1

to_shellcode()
{
    counter=0

    IFS=$'\n'                                               # Split for each line                                                     
    for line in `echo -n "$1" | hexdump`; do                # For each line in hexdump                                                

        IFS=" "                                             # Split for each space                                                    

        for byte in $(echo "$line" | cut -c 9-); do         # For each byte pair in line                                              
            echo -n "\x"
            echo -n $byte | cut -c 3- | awk '{printf $0}'   # Print the seconde one                                                   
            echo -n "\x"
            echo -n $byte | cut -c -2 | awk '{printf $0}'   # Print the first one                                                     
            counter=$((counter + 2))                        # MIGHT COUNT THE LAST NULL                                               
                                                            # BYTE IF ODD NUMBER OF BYTES                                             
        done
        IFS='\n'
    done
}


echo -n -e "$PREAMBLE$(to_shellcode $SERIAL)" > /var/lib/dhcpv6/dhcp6c_duid

cat << EOF > "/var/run/dhcp6c-$WAN-pd.conf"
interface $WAN {
    send ia-na 1;
    send ia-pd 1;
    request domain-name-servers;
    request ntp-servers;
};

id-assoc na 1 {};
id-assoc pd 1 {
    prefix ::/60 21600 86400;
    prefix-interface $LAN {
        sla-id 0;
        sla-len 4;
        ifid 1;
    };
};
EOF

/opt/vyatta/bin/vyatta-op-cmd-wrapper renew dhcpv6-pd interface $WAN

@janthony6: The first pair of bytes is the length of the DUID and whether it's \x00\x19 or \x19\x00 depends on the endianess of your device. The ER-X is little-endian, so on that device \x19\x00 is correct. The other EdgeOS devices (ERLite, ER4) are big-endian so \x00\x19 is correct. The remaining bytes should all be big-endian regardless of the device's endianess. Relevant code:

https://github.com/opnsense/dhcp6c/blob/e36db7ea3989716c240d671a80e816b3cd4f9ff5/common.c#L1072