Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Toad
On Thu, Jan 20, 2005 at 01:04:23PM +, Ben Golding wrote: > > > FYI, I tested this in the company LAN and the largest value that got > > > through was 1472. > > > > Ethernet's MTU is 1500. IP uses 28 bytes, so that leaves 1472 bytes > > for data. UDP uses additional 8 bytes and TCP 20 bytes. >

Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Ben Golding
> > FYI, I tested this in the company LAN and the largest value that got > > through was 1472. > > Ethernet's MTU is 1500. IP uses 28 bytes, so that leaves 1472 bytes > for data. UDP uses additional 8 bytes and TCP 20 bytes. Thanks Mika, in other words if you can ping with "-l 1472" as the maximu

Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Mika Hirvonen
On Thu, 20 Jan 2005 11:49:12 +0200, Constantine Dokolas <[EMAIL PROTECTED]> wrote: > Hmm... I thought there was an easier way... whatever. I must remember old > PPP connection logs (or was that some other protocol?). Yes, PPP is used to encapsulate TCP/IP over modem lines. PPP's derivates (PPPoE

Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Constantine Dokolas
Mika Hirvonen wrote: On Thu, 20 Jan 2005 11:18:47 +0200, Constantine Dokolas <[EMAIL PROTECTED]> wrote: Ben Golding wrote: I think 576 is the recommendation for best performance whether on ADSL or dial-up, several sites seem to confirm this eg: http://www.jimschrempp.com/features/computer/mtuspeed.

Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Mika Hirvonen
On Thu, 20 Jan 2005 11:18:47 +0200, Constantine Dokolas <[EMAIL PROTECTED]> wrote: > Ben Golding wrote: > > I think 576 is the recommendation for best performance whether on ADSL > > or dial-up, several sites seem to confirm this eg: > > > > http://www.jimschrempp.com/features/computer/mtuspeed.htm

Re: [freenet-support] Modem lines MTU?

2005-01-20 Thread Constantine Dokolas
Ben Golding wrote: I think 576 is the recommendation for best performance whether on ADSL or dial-up, several sites seem to confirm this eg: http://www.jimschrempp.com/features/computer/mtuspeed.htm MTU = 1500 is normal for Ethernet LANs. How can I find out the MTU for my dial-up on a W2K machine?

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Todd Walton
On Wed, 19 Jan 2005 18:04:25 +, Ben Golding <[EMAIL PROTECTED]> wrote: > Anyway, here is some interesting info about finding your personal max > MTU: > http://www.internetweekly.org/llarrow/mtumss.html > http://members.tripod.com/~EasyMTU/easymtu/findmtu.html Nifty. I'm getting somewhere betw

[freenet-support] Modem lines MTU?

2005-01-19 Thread Newsbyte
"Are you saying that hosts are required to support MTUs of at least 576 bytes? People have said that some dialup connections use 256 byte MTUs... " Since it says "HOSTS MUST NOT SEND DATAGRAMS LARGER THAN 576 OCTETS" there is no inherent contradiction when it is *smaller* then 576, me thinks? H

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Magnus Eriksson
On Wed, 19 Jan 2005, Toad wrote: > Are you saying that hosts are required to support MTUs of at least 576 > bytes? People have said that some dialup connections use 256 byte > MTUs... > > RFC879> HOSTS MUST NOT SEND DATAGRAMS LARGER THAN 576 OCTETS UNLESS Isn't MTU something which is neg

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Phillip Hutchings
On Wed, 19 Jan 2005 19:16:44 +, Toad <[EMAIL PROTECTED]> wrote: > Are you saying that hosts are required to support MTUs of at least 576 > bytes? People have said that some dialup connections use 256 byte > MTUs... Hrm. Dialup. The MTU includes the PPP header is max. 30 bytes, IP header can be

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Toad
Are you saying that hosts are required to support MTUs of at least 576 bytes? People have said that some dialup connections use 256 byte MTUs... On Wed, Jan 19, 2005 at 06:04:25PM +, Ben Golding wrote: > Toad> "Please find me an internet standard that mentions an MTU of 576 > bytes" > > RFC87

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Ben Golding
Toad> "Please find me an internet standard that mentions an MTU of 576 bytes" RFC879> HOSTS MUST NOT SEND DATAGRAMS LARGER THAN 576 OCTETS UNLESS THEY RFC879> HAVE SPECIFIC KNOWLEDGE THAT THE DESTINATION HOST IS PREPARED TO RFC879> ACCEPT LARGER DATAGRAMS. RFC879> RFC879> Th

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Frank v Waveren
On Wed, Jan 19, 2005 at 04:36:11PM +, Toad wrote: > Yuck! I'm skeptical... Could well be snake oil. Please find me an > internet standard that mentions an MTU of 576 bytes - or even some cisco > documentation. It seems pretty clear that bigger is better within the > limits available... Bigger=H

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Toad
Yuck! I'm skeptical... Could well be snake oil. Please find me an internet standard that mentions an MTU of 576 bytes - or even some cisco documentation. It seems pretty clear that bigger is better within the limits available... On Wed, Jan 19, 2005 at 04:32:02PM +, Ben Golding wrote: > I thin

Re: [freenet-support] Modem lines MTU?

2005-01-19 Thread Ben Golding
I think 576 is the recommendation for best performance whether on ADSL or dial-up, several sites seem to confirm this eg: http://www.jimschrempp.com/features/computer/mtuspeed.htm MTU = 1500 is normal for Ethernet LANs. Ben Golding ___ Support mailing

[freenet-support] Modem lines MTU?

2005-01-19 Thread Toad
What's the typical MTU on a modem? Someone said he had seen one with 256 bytes, but is that typical? -- Matthew J Toseland - [EMAIL PROTECTED] Freenet Project Official Codemonkey - http://freenetproject.org/ ICTHUS - Nothing is impossible. Our Boss says so. signature.asc Description: Digital sig