tmplinshi

@echo off
setlocal disabledelayedexpansion

set "file=a.txt"
set "begin=<def_ip>"
set "end=<mac2ip>"
set "_skip="

findstr /n .* "%file%" >..tmp

(
    for /f "delims=" %%i in (..tmp) do (
        set str=%%i
        setlocal enabledelayedexpansion
        set str=!str:*:=!
        if /i "!str!" == "!begin!" set _skip=#
        if /i "!str!" == "!end!" set _skip=
        if not defined _skip echo,!str!
        for %%i in ("!_skip!") do (
            endlocal
            set _skip=%%~i
        )
    )
) >"%file%"

del ..tmp
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