[Dnsmasq-discuss] [PATCH] add --tftp-mtu option to set the MTU for the TFTP server

[五月]

Greetings.

I think it would be better to be "--tftp-blksize", as this is already defined in RFC 2347. If some buggy client said he want bigger, the server could reply --tftp-blksize is the maximum.

In my understanding of TFTP, it would be strange that a client requested a big blksize option then deny fragmented packets. It's the client said he want a big one, not the server. Why fix this on server?

I think it would be a bad idea to request a super big blksize option to increase performance. I think the blksize option shouldn't bigger than Ethernet MTU. Because there are buggy client refusing IPv4 fragment and there is no fragmentation in IPv6. To get more speed, the right way is RFC 7440. However RFC 7440 is still not widely supported. If writing new code, I think it would be better to follow RFC 7440 way, and left those old buggy slow client behind.

Dnsmasq is great~ >_<


五月
2016.2







> To: dnsmasq-discuss at lists.thekelleys.org.uk
> From: simon at thekelleys.org.uk
> Date: Wed, 24 Feb 2016 22:06:15 +0000
> Subject: Re: [Dnsmasq-discuss] [PATCH] add --tftp-mtu option to set the MTU for the TFTP server
> 
> -----BEGIN PGP SIGNED MESSAGE-----
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> 
> Thanks for that.
> 
> 
> I've somewhat reworked it so that the supplied MTU is a ceiling (ie,
> you can reduce the used MTU with the option, but not increase it.)
> That would seem to be safer.
> 
> 
> In the git repo now. Please shout if I've broken things for you.
> 
> 
> 
> cheers,
> 
> Simon.
> 
> 
> On 24/02/16 18:24, Patrick McLean wrote:
> > Some BIOSes don't like fragmented packets, and it's useful to be
> > able to netboot over MTU limited links, but it's annoying to set
> > the interface MTU for only TFTP. This patch adds a tftp-mtu option
> > to override getting the MTU from the interface.
> > 
> > 
> > 
> > _______________________________________________ Dnsmasq-discuss
> > mailing list Dnsmasq-discuss at lists.thekelleys.org.uk 
> > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> > 
> 
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