Well now I suppose you could mention pmtu and black hole discovery which
is where experiences with MS suffer. Won't Linux Ethernet drivers adjust
packet sizes in accordance with pmtu so that you can just set mtu at 1500
and forget it?
Jim Flowers <[EMAIL PROTECTED]>
#4 ISP on C|NET, #1 in Ohio
On Mon, 8 May 2000, Dennis wrote:
> At 12:08 AM 5/7/00 -0400, TheGolem wrote:
> >In my /etc/sysconfig/network-scripts/ifcfg-ppp0 script file, I have MTU set
> >to 578 (which was optimum for Windows -- but, I'm not sure it is for
> >Linux?) and MRU set to 1000. Not getting errors, but for max
> >efficiency, shouldn't the Maximum Transfer Units be higher? Say, around 1000?
>
> In the old days, routers didnt forward frames larger then 570 some odd
> bytes by spec...now they almost universally use 1500 as the mtu. This was
> because lines had more errors and backbone speeds were slower and switches
> and routers had memory contraints...issues that no longer exist.
>
> The smaller mtu with dialup lines, again archaic, originated in that dial
> up lines had more errors and retransmissions would be reduced if the
> packets were smaller. With internal modems and improved error correction,
> this is not usually valid either anymore.
>
> if you send packets larger than 1500 bytes they will most likely be
> fragmented, which you dont want. any number below should be fine. "Optimal"
> is larger, so send the largest that you can without forcing fragmentation.
>
> DB
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