Re: [Qemu-devel] [PATCH] slirp: support dynamic block size for TFTP transfers

[H. Peter Anvin]

On 11/21/16 11:45, Hervé Poussineau wrote:
> The blocksize option is defined in RFC 1783.
> We now support block sizes between 1 and 1432 bytes, instead of 512 only.

It ought to be 1476: Ethernet MTU = 1500, minus a minimum of 20 bytes
for an IPv4 header and 4 for a TFTP header.

Some bootloaders including Syslinux sandbag this value to avoid creating
fragmented packets in case there is a VPN or something similar in the
network path.

        -hpa