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Re: [SOLVED] Can I run dnsmasq as boot server in my environment

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On Tue, Mar 03, 2020 at 12:36:42AM +0100, deloptes wrote:
> john doe wrote:

[...]

> The trick was to add following line to the dhcpd.conf
> 
>    option vendor-encapsulated-options
> 6:1:3:a:4:0:50:58:45:9:14:0:0:11:52:61:73:70:62:65:72:72:79:20:50:69:20:42:6f:6f:74:ff;
> 
> This could be added to a class, but I have only one rpi4, so added directly
> to the client config.
> 
> The other trick is to set root-path to the tftp boot directory.
> 
> If there is more curiosity what happens on the network, use this
> 
>         tcpdump -Xvv  udp port 67 or port 68 or port 69
> 
> Amazing!
> 
> I would like to know what vendor-encapsulated-options is. The end of it
> translates to Raspberry Pi Boot\0. But the first part ... ???
> In anycase it does the magic

Thanks for making all of us smarter. To throw my two cents in, I did some
legwork, and (as usually) Wikipedia [1] provides some light.

Those options are encoded as

 - code: 1 octet
 - length (of following data): 1 octet
 - data <length> octets.

They are closed off by one "option" 0xff with no length octet.

So taking apart your magic string above (and rewriting a bit to
make more readable):

  06 01  03
  0a 04  00 50 58 45
  09 14  00 00 11 52  61 73 70 62
         65 72 72 79  20 50 69 20
         42 6f 6f 74
  ff

But the codes, alas, are not interpretable according to the
ref given. An exercise for the reader :)

Cheers
[1] https://en.wikipedia.org/wiki/DHCP#Options
-- tomás

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Thread

Can I run dnsmasq as boot server in my environment deloptes <deloptes@gmail.com> - 2020-02-29 16:10 +0100
  Re: Can I run dnsmasq as boot server in my environment john doe <johndoe65534@mail.com> - 2020-02-29 18:10 +0100
    Re: Can I run dnsmasq as boot server in my environment deloptes <deloptes@gmail.com> - 2020-02-29 18:30 +0100
      Re: Can I run dnsmasq as boot server in my environment john doe <johndoe65534@mail.com> - 2020-02-29 18:40 +0100
        [SOLVED] Can I run dnsmasq as boot server in my environment deloptes <deloptes@gmail.com> - 2020-03-03 00:40 +0100
          Re: [SOLVED] Can I run dnsmasq as boot server in my environment deloptes <deloptes@gmail.com> - 2020-03-03 09:20 +0100
          Re: [SOLVED] Can I run dnsmasq as boot server in my environment <tomas@tuxteam.de> - 2020-03-03 09:40 +0100
            Re: [SOLVED] Can I run dnsmasq as boot server in my environment David <bouncingcats@gmail.com> - 2020-03-03 12:40 +0100
              Re: [SOLVED] Can I run dnsmasq as boot server in my environment <tomas@tuxteam.de> - 2020-03-03 13:50 +0100
              Re: [SOLVED] Can I run dnsmasq as boot server in my environment deloptes <deloptes@gmail.com> - 2020-03-03 21:10 +0100
                Re: [SOLVED] Can I run dnsmasq as boot server in my environment Jonas Smedegaard <jonas@jones.dk> - 2020-03-03 21:50 +0100

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