[ipxe-devel] iPXE does not honor DHCP option 26

Oliver Rath rath at mglug.de
Fri Aug 29 12:29:15 UTC 2014

Hi Kosta,

for now you can change

#define ETH_FRAME_LEN           1514    /* Maximum packet */

in src/include/ipxe/if_ether.h to your needs.

@Michael: Maybe it is a good idea for an general array
dhcpoffers[0..255], where dhcp-offers can be found? Or something like
${dhcp/option26:string}? Many dhcp-options could be useful for building
appropriate menu-requests.


On 27.08.2014 08:12, Kosta Velikov wrote:
> Hello there,
> I am happy user of iPXE. It has helped me many times. I have been
> using it for more than 3 years.
> Only yesterday I found that it does not take into account the DHCP
> option 26 - MTU size. I tried to use it on a server that resides in a
> network connected via ipsec tunnel (tried with other means of VPN too)
> to the DHCP/TFTP server. VPN has some overhead, and it requires MTU of
> 1470 or less. This is configured in the DHCP server as option 26, and
> the Ubuntu servers honor it, but iPXE does not take it into account.
> Please add this functionality for the next release :)
> Thank you.
> Kosta Velikov.
> _______________________________________________
> ipxe-devel mailing list
> ipxe-devel at lists.ipxe.org
> https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
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