MTU on the Internet [7:14380]
Greetings, What's the common/standard mtu on the internet backbone? At one point all ISPs used 572 size. Any internet resources you guys can point me to? Thanks, Nabil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14380&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
SONET interfaces generally use 4470, if that's what you mean by internet backbone. -dre ""Nabil Fares"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Greetings, > > What's the common/standard mtu on the internet backbone? At one point all > ISPs used 572 size. Any internet resources you guys can point me to? > > Thanks, > > Nabil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14382&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: MTU on the Internet [7:14380]
I thought the minimum MTU size was 576..! -Joe -Original Message- From: Nabil Fares [mailto:[EMAIL PROTECTED]] Sent: Tuesday, July 31, 2001 10:19 AM To: [EMAIL PROTECTED] Subject: MTU on the Internet [7:14380] Greetings, What's the common/standard mtu on the internet backbone? At one point all ISPs used 572 size. Any internet resources you guys can point me to? Thanks, Nabil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14386&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
There was actually some recent debate on this issue within the ISIS wg in the IETF from some notable folks including Tony Li from Procket (ex Juniper/Cisco). In reality, there isn't a standard IP MTU in use which can create some problems. Some of the key issues include the use of private addressing which breaks path MTU discovery and the ever more frequent use of encapsulation strategies (IPSec/MPLS etc). Some harmonization of this value would certainly seem valuable. Most major router vendors support MTU's up to 9180 in size however, you see a lot of the following in the internet: 10/100 Ethernet devices at 1518, POS at 4470, FDDI at 4470 (less and less FDDI) and GigE at >4469, Greetings, > >What's the common/standard mtu on the internet backbone? At one point all >ISPs used 572 size. Any internet resources you guys can point me to? > >Thanks, > >Nabil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14389&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
It was with the proliferation of Ethernet/Sonet this 576 byte MTU is disappearing. Anyone aware of what equipment actually still has this MTU. ""JoJo Aricat"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I thought the minimum MTU size was 576..! > > -Joe > -Original Message- > From: Nabil Fares [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, July 31, 2001 10:19 AM > To: [EMAIL PROTECTED] > Subject: MTU on the Internet [7:14380] > > > Greetings, > > What's the common/standard mtu on the internet backbone? At one point all > ISPs used 572 size. Any internet resources you guys can point me to? > > Thanks, > > Nabil Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14391&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
Have you done a search in Google? I would think you could find some info on this with some work. Let us know what you find out. ;-) My thought was that it would not be a good idea to use 572 bytes since so many Internet devices send 1500-byte Ethernet frames. The 572 bytes size would mean routers in the core of the Internet would have to do fragmentation and reassembly which would really slow things down and be a bad idea. So my guess is that the MTU is 1500 or greater wherever possible. Priscilla At 01:19 PM 7/31/01, Nabil Fares wrote: >Greetings, > >What's the common/standard mtu on the internet backbone? At one point all >ISPs used 572 size. Any internet resources you guys can point me to? > >Thanks, > >Nabil Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14565&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
To my knowledge, there are no proponents of sub 1518 byte IP MTU's to be used as defaults on internet routers. I would tend to think that at least 4470 would make sense. Per my previous post in this thread, I am of the opinion that a consensus hasn't been reached at this point on this issue. For information, I would target the IET F since changes in this matter will likely be driven from the vendor space who currently pay some attention to the IETF.. *** REPLY SEPARATOR *** On 8/1/2001 at 5:40 PM Priscilla Oppenheimer wrote: >Have you done a search in Google? I would think you could find some info >on >this with some work. Let us know what you find out. ;-) > >My thought was that it would not be a good idea to use 572 bytes since so >many Internet devices send 1500-byte Ethernet frames. The 572 bytes size >would mean routers in the core of the Internet would have to do >fragmentation and reassembly which would really slow things down and be a >bad idea. So my guess is that the MTU is 1500 or greater wherever possible. > >Priscilla > >At 01:19 PM 7/31/01, Nabil Fares wrote: >>Greetings, >> >>What's the common/standard mtu on the internet backbone? At one point all >>ISPs used 572 size. Any internet resources you guys can point me to? >> >>Thanks, >> >>Nabil > > >Priscilla Oppenheimer >http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14567&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
Send to the list, not me. At 07:35 PM 8/1/01, you wrote: >This is a legacy default that prevented fragmentation on older transmission >mediums I think SDLC was one of them, but not sure if that was one or not. >See RFC879. > >- Original Message - >From: "Priscilla Oppenheimer" >To: >Sent: Wednesday, August 01, 2001 5:40 PM >Subject: Re: MTU on the Internet [7:14380] > > > > Have you done a search in Google? I would think you could find some info >on > > this with some work. Let us know what you find out. ;-) > > > > My thought was that it would not be a good idea to use 572 bytes since so > > many Internet devices send 1500-byte Ethernet frames. The 572 bytes size > > would mean routers in the core of the Internet would have to do > > fragmentation and reassembly which would really slow things down and be a > > bad idea. So my guess is that the MTU is 1500 or greater wherever >possible. > > > > Priscilla > > > > At 01:19 PM 7/31/01, Nabil Fares wrote: > > >Greetings, > > > > > >What's the common/standard mtu on the internet backbone? At one point >all > > >ISPs used 572 size. Any internet resources you guys can point me to? > > > > > >Thanks, > > > > > >Nabil > > > > > > Priscilla Oppenheimer > > http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14577&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MTU on the Internet [7:14380]
Sorry about that. Didn't realize that "Reply to:" doesn't get set to the list, most lists that I'm on do. - Original Message - From: "Priscilla Oppenheimer" To: Sent: Wednesday, August 01, 2001 8:09 PM Subject: Re: MTU on the Internet [7:14380] > Send to the list, not me. > > At 07:35 PM 8/1/01, you wrote: > >This is a legacy default that prevented fragmentation on older transmission > >mediums I think SDLC was one of them, but not sure if that was one or not. > >See RFC879. > > > >- Original Message - > >From: "Priscilla Oppenheimer" > >To: > >Sent: Wednesday, August 01, 2001 5:40 PM > >Subject: Re: MTU on the Internet [7:14380] > > > > > > > Have you done a search in Google? I would think you could find some info > >on > > > this with some work. Let us know what you find out. ;-) > > > > > > My thought was that it would not be a good idea to use 572 bytes since so > > > many Internet devices send 1500-byte Ethernet frames. The 572 bytes size > > > would mean routers in the core of the Internet would have to do > > > fragmentation and reassembly which would really slow things down and be a > > > bad idea. So my guess is that the MTU is 1500 or greater wherever > >possible. > > > > > > Priscilla > > > > > > At 01:19 PM 7/31/01, Nabil Fares wrote: > > > >Greetings, > > > > > > > >What's the common/standard mtu on the internet backbone? At one point > >all > > > >ISPs used 572 size. Any internet resources you guys can point me to? > > > > > > > >Thanks, > > > > > > > >Nabil > > > > > > > > > Priscilla Oppenheimer > > > http://www.priscilla.com > > > Priscilla Oppenheimer > http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=14583&t=14380 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
