http://www.thelinuxwiki.com/index.php?action=history&feed=atom&title=flashing_openwrt_via_pxe_boot 2026-04-29T02:45:57Z Revision history for this page on the wiki MediaWiki 1.21.5 http://www.thelinuxwiki.com/index.php?title=flashing_openwrt_via_pxe_boot&diff=1427&oldid=prev 2022-05-27T19:43:01Z

<p>Created page with &quot;== setup pxe boot server == install dnsmasq if needed create tftpboot directory and put firmware from dd-wrt or openwrt in it. download firmware upgrade file and put it in...&quot;</p> <p><b>New page</b></p><div>== setup pxe boot server ==<br /> <br /> install dnsmasq if needed<br /> <br /> create tftpboot directory and put firmware from dd-wrt or openwrt in it.<br /> download firmware upgrade file and put it in directory<br /> make directory world readable<br /> rename firmware file to firmware.bin<br /> <br /> start dnsmasq via command line<br /> dnsmasq --port=0 --enable-tftp --tftp-root=/path/to/firmware/directory --tftp-no-blocksize --user=root --group=root<br /> <br /> verify network port is successfully bound<br /> root@mypxeserver:/etc# netstat -anp | grep &quot;:69&quot;<br /> udp 0 0 0.0.0.0:69 0.0.0.0:* 3674/dnsmasq <br /> <br /> == flash device ==<br /> <br /> connect device to you network port of the pxe server. be sure your network doesn't have another active dhcp server on it! I used a direct connect via crossover cable.<br /> <br /> I decided to watch with tcpdump. notice request for firmware.bin<br /> # tcpdump -i enp5s0<br /> 12:46:36.413672 ARP, Request who-has 192.168.10.100 tell 192.168.10.101, length 46 <br /> 12:46:36.413700 ARP, Reply 192.168.10.100 is-at 44:a8:42:fc:ea:c2 (oui Unknown), length 28<br /> 12:46:36.425540 IP 192.168.10.101.3727 &gt; 192.168.10.100.tftp: 31 RRQ &quot;firmware.bin&quot; octet timeout 3<br /> 12:46:36.425689 IP 192.168.10.100.60235 &gt; 192.168.10.101.3727: UDP, length 516<br /> 12:46:36.425834 IP 192.168.10.101.3727 &gt; 192.168.10.100.60235: UDP, length 4<br /> 12:46:36.425892 IP 192.168.10.100.60235 &gt; 192.168.10.101.3727: UDP, length 516<br /> 12:46:36.426035 IP 192.168.10.101.3727 &gt; 192.168.10.100.60235: UDP, length 4<br /> ...</div>

Nighthawk