etherboot-developers

Re: [Etherboot-developers] Surprising 57, Maximum DHCP Message Size

[Ken Y. <ke...@nl...>]

|Etherboot version 4.7.21 surprisingly offers a 
|maximum message size of 1572.  I think that is
|72 bytes too large for ethernet, unless he'll
|accept multiple packets.

It will be limited by the MTU of the transmitting interface anyway.  No
DHCP server should send out a packet that large. But probably
MAX_BOOTP_EXTLEN should be defined as
ETH_FRAME_LEN-ETH_HLEN-sizeof(struct iphdr)-sizeof(struct
udphdr)-sizeof(struct bootp_t)

I'll change it to that in .22. Thanks.

Re: [Etherboot-developers] Surprising 57, Maximum DHCP Message Size

[Ken Y. <ke...@nl...>]

|The 1500 byte maximum includes the 28 bytes of 
|IP and UDP header and the UDP payload.

Ok, that makes it simpler.

Re: [Etherboot-developers] Surprising 57, Maximum DHCP Message Size

[CJ <cj...@cj...>]

The 1500 byte maximum includes the 28 bytes of 
IP and UDP header and the UDP payload.

Ken Yap wrote:
> 
> |Etherboot version 4.7.21 surprisingly offers a
> |maximum message size of 1572.  I think that is
> |72 bytes too large for ethernet, unless he'll
> |accept multiple packets.
> 
> It will be limited by the MTU of the transmitting interface anyway.  No
> DHCP server should send out a packet that large. But probably
> MAX_BOOTP_EXTLEN should be defined as
> ETH_FRAME_LEN-ETH_HLEN-sizeof(struct iphdr)-sizeof(struct
> udphdr)-sizeof(struct bootp_t)
> 
> I'll change it to that in .22. Thanks.
> 
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