[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] slirp: support dynamic block size for TFTP tran
|
From: |
H. Peter Anvin |
|
Subject: |
Re: [Qemu-devel] [PATCH] slirp: support dynamic block size for TFTP transfers |
|
Date: |
Mon, 21 Nov 2016 11:51:51 -0800 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
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