[Dnsmasq-discuss] Possible bug setting dhcp-option 17

[Michael Welle]

Hi,

Simon Kelley wrote:
> 
> Michael Welle wrote:
> > Hi,
> > 
> > I wanted to net boot some Sparc machines using dnsmasq:
> > 
> > dhcp-option=17,"/export/elena/root"
> > dhcp-boot=/tftpboot/boot.net.netbsd,bootsvr,192.168.42.1
> > 
> > But setting the root-path doesn't work if the path is longer than 8
> > characters. The first condition in do_opt() (rfc2131.c) evaluates to
> > true and the operation returns immediately. Is this a configuration
> > error or a bug in dnsmasq?
> 
> That code is checking for overflow, so it looks like you are generating 
> a DHCP packet that's too big. Are you sending lots of options? If
> so, 
no, this is the only option. Plus the default options set by
dnsmasq. 


> and there's some which aren't necessary, a simple workaround would be to 
> trim the number of options so they fit in a minimum-sixed DHCP packet.
> 
> There exist facilities in the protocol to negotiate a larger packet size 
> when both client and server support it: that's not currently implemented 
> in dnsmasq, but it would provide another solution if it were.
You mean option 57 max msg size? Hm, the current packet size seems to
be 328 byte. How is it calculated? 

Regards 
Michael