Re: Classless IP support for IPv4 PXE boot

["Fu, Siyuan" <siyuan.fu@intel.com>]

Hi, Naveen

May I know the GIT version of the 21543, or the subject of the commit message? I can't see the svn revision number on my side.

Thanks
Siyuan

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Santhapur Naveen
> Sent: Wednesday, August 17, 2016 7:41 PM
> To: edk2-devel@lists.01.org
> Cc: Sivaraman Nainar <sivaramann@amiindia.co.in>; Madhan B. Santharam
> <madhans@ami.com>
> Subject: [edk2] Classless IP support for IPv4 PXE boot
> 
> Hello,
> 
>           We happened to observe that the IPv4 PXE boot was happening
> successfully for both classless and classful IPs until the EDKII revision
> 21542. It has been found that there are some changes made in the revision
> 21543 and the IPv4 PXE boot is failing for classless IP addresses. The
> failure scenario was debugged and is explained here. Let's assume the
> subnet range is 192.168.1.0/16. The DHCP server tries to allot an IP
> (let's say 192.168.1.0) but based on the first byte of the IP address to
> be assigned, the function NetGetIpClass() returns the IP class as Class-C
> and its respective subnet mask as 255.255.255.0 that should be for a
> classful IP address whereas 255.255.0.0 is the actual subnet in this
> scenario. The changes present in function Dhcp4InstanceConfigUdpIo() seems
> to be responsible for the failure.
> 
> May we know the reason behind the changes present in the Dhcp4Impl.c of
> the revision 21543? Is there any plan to bring the classless IP support in
> NetworkPkg?
> 
> 
> Thanks,
> Naveen
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