Is there a way to migrate static IPs from the older Merlin firmware to NG?

[monakh]

Howdy, long time Merlin user.

I want to migrate to the NG firmware (still stuck on 380.70) but I have about a 100 or so IPs defined in the static pool via DHCP reservations. Is there a way to migrate them since you can't do a dirty upgrade?

 

[ColinTaylor]

This has been asked a lot. Search the forums for dhcp_staticlist.

 

[monakh]

My bad, I did search before I posted. Thanks for the search tip.

 

[Martineau]

My bad, I did search before I posted. Thanks for the search tip.

The methods posted in the forum may not work with v384.xx.

I suggest you confirm the current size of your 'dhcp_staticlist'.....to comply with the v384.xx NVRAM variable size limits.

I used a script containing the following code snippet to manually migrate the DHCP reserved list and Port Forward (vserver) entries etc.

#!/bin/sh
Say(){
   echo -e $$ $@ | logger -st "($(basename $0))"
}
Get_MAX_NVRAM_size () {
    local NVRAM_VAR=$1
 
    if [ -z "$2"  ];then
        Say "Retrieving NVRAM variable '"$NVRAM_VAR"' Maximum size value limit from RMerlin Github...."
    fi
 
    local CKN_STRsize=$(curl -s https://github.com/RMerl/asuswrt-merlin.ng/blob/40ba6c41a6a40d71427d871948232556d40935e1/release/src/router/shared/defaults.c | grep $NVRAM_VAR | grep -oE "(CKN_STR)([0-9]{1,4})" | grep -oE "([0-9]{1,4})")
    local RC=$?
 
    if [ $RC -eq 0 ] && [ ! -z "$CKN_STRsize" ];then
        if [ -z "$2" ];then
            Say "Retrieved NVRAM variable '"$NVRAM_VAR"' Maximum size limit value="$CKN_STRsize
        fi
    else
        Say "***ERROR Unable to retrieve NVRAM variable '"$NVRAM_VAR"' Maximum size value limit from RMerlin Githib - RC="$RC "(Default 255 assumed)"
        local CKN_STRsize=255                   # default
    fi
 
    echo $CKN_STRsize
 
 
}

NVRAM_VAR="dhcp_staticlist"

echo -e

NVRAM_VAR_MAX_SIZE=$(Get_MAX_NVRAM_size "$NVRAM_VAR")

echo -e "\tNVRAM variable '"$NVRAM_VAR"' MAXIMUM size allowed is" $NVRAM_VAR_MAX_SIZE "bytes"

OLD_NVRAM=$(nvram get dhcp_staticlist)
OLD_NVRAM_SIZE=$(echo $OLD_NVRAM | awk '{print length()}' )

OLD_NVRAM_CNT=$(echo $OLD_NVRAM | awk -F\< '{print NF-1}')

OLD_NVRAM_DATA=$(nvram get dhcp_staticlist | tr -d "<>")
OLD_NVRAM_DATA_SIZE=$(echo $OLD_NVRAM_DATA | awk '{print length()}' )

echo -e $cBWHT"\n\tCurrent NVRAM '"$NVRAM_VAR"' variable is" $OLD_NVRAM_SIZE "bytes in length (Data="$OLD_NVRAM_DATA_SIZE") CNT="$OLD_NVRAM_CNT"\n"


exit

e.g.

(ChkNVRAM.sh): 718 Retrieving NVRAM variable 'dhcp_staticlist' Maximum size value limit from RMerlin Github....

(ChkNVRAM.sh): 718 Retrieved NVRAM variable 'dhcp_staticlist' Maximum size limit value=2999

 NVRAM variable 'dhcp_staticlist' MAXIMUM size allowed is 2999 bytes

 Current NVRAM 'dhcp_staticlist' variable is 2994 bytes in length (Data=2768) CNT=75

If your 100 entries exceed the max character limit then you will need to manually add the entries that exceed the maximum NVRAM variable size to '/jffs/configs/dnsmasq.conf.add'