[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

MTU

Subject: MTU
From: saad17621 at gmail.com (Saad Abdullah)
Date: Sat, 23 Jul 2016 00:48:08 +1000
In-reply-to: <CAOOLXZigQiwG-aRhne-R96gbBciSBpn6E6HYA6Xi94rcigmR1Q@mail.gmail.com>
References: <CAPkb-7CRMNUK6Av-BBzUgMLh2YW0XfxDs4x4P4rJg6ookVNP=A@mail.gmail.com> <CAPkb-7BBOnWSgLkrOFGMkAp-PHyhxwD0cctmvsN+wWgzw+vp-Q@mail.gmail.com> <CAPkb-7CKUF76__dd9Rk2dtswbW82009A4yGY0ZMO4vTik9D0Jg@mail.gmail.com> <CAPkb-7BUTaims9cfAs+HKKu9cMZ-z6U0ppk0xTyovBOgi1vd=Q@mail.gmail.com> <CAPkb-7A0jXgq4=yyhkPhbw5Sxc_kg+fgr_Zk+N8maBPu+mn_Qg@mail.gmail.com> <CAPkb-7B6cav2LHgdCE6Ywq4pKgb1MqVjEgKoFZG+JzKf73cA8w@mail.gmail.com> <CAPkb-7CTi_ekX35OcjdwqfM+W-gdkfkfpLsHXxhH5bVr=nyv3A@mail.gmail.com> <CAPkb-7CnxtLuWWA+PDx2ba_xkaE54+Ei4NAbZp7TzvgdGi2Auw@mail.gmail.com> <CAPkb-7B3geM2iydgmidq+gFh4oJvzbCj_eznQSvLRhi3LGgvCA@mail.gmail.com> <CAPkb-7C78wAAYrdfgZB65W=tJRumUb3qbVGVE1u28V7DTP82Ww@mail.gmail.com> <CAPkb-7A1RsiN=tv6YuggARbUx2u8EDOUyHc__BJ6iB=UFWxs4Q@mail.gmail.com> <CAPkb-7AQTQnuv9baaO=yEG0e+s0O1ppopafsCNoP8bSuCMysxg@mail.gmail.com> <CAPkb-7AXhoCrVnWv+pzbJGPW86mvzGmGuitqscqQ7AJFrriDRg@mail.gmail.com> <CAPkb-7BaGqybRDLRd01E65bmzoc-1ebnuYsEtYsSU8VLu5dp3A@mail.gmail.com> <CAPkb-7BAjMO2sdY=87J6S6yd8oecyr1gyJa_jqaQUy7=XU0oAw@mail.gmail.com> <CAPkb-7A5TgL+dL8D48sccHSCVcHWEah9sv3hZT-7j=kN4aKnYQ@mail.gmail.com> <CAPkb-7DtxSt=9vgBviZBSaxN57q=wkDJw+6m=RBmf01s9GtVXw@mail.gmail.com> <CAPkb-7AOoQ4=7cCuqwN96u-q5cBsr6q1aTnQ8sxW83LNqcjb2g@mail.gmail.com> <CAGfMMhxOT0J9ER7X-k3vRhTLZ9tSq9qZZSMoYFCE7-i2G8185g@mail.gmail.com> <CAOOLXZigQiwG-aRhne-R96gbBciSBpn6E6HYA6Xi94rcigmR1Q@mail.gmail.com>

Worth reading this on choosing MTU on transit link.

http://blog.apnic.net/2014/12/15/ip-mtu-and-tcp-mss-missmatch-an-evil-for-network-performance/

-Sad



>>
>> On Fri, Jul 22, 2016 at 10:01 PM, Baldur Norddahl <
>> baldur.norddahl at gmail.com> wrote:
>>
>>> Hi
>>>
>>> What is best practice regarding choosing MTU on transit links?
>>>
>>> Until now we have used the default of 1500 bytes. I now have a project
>>> were
>>> we peer directly with another small ISP. However we need a backup so we
>>> figured a GRE tunnel on a common IP transit carrier would work. We want
>>> to
>>> avoid the troubles you get by having an effective MTU smaller than 1500
>>> inside the tunnel, so the IP transit carrier agreed to configure a MTU of
>>> 9216.
>>>
>>> Obviously I only need to increase my MTU by the size of the GRE header.
>>> But
>>> I am thinking is there any reason not to go all in and ask every peer to
>>> go
>>> to whatever max MTU they can support? My own equipment will do MTU of
>>> 9600
>>> bytes.
>>>
>>> On the other hand, none of my customers will see any actual difference
>>> because they are end users with CPE equipment that expects a 1500 byte
>>> MTU.
>>> Trying to deliver jumbo frames to the end users is probably going to end
>>> badly.
>>>
>>> Regards,
>>>
>>> Baldur
>>>
>>
>>
>

References:
- MTU
  - From: baldur.norddahl at gmail.com (Baldur Norddahl)

Prev by Date: MTU
Next by Date: MTU
Previous by thread: BGP & MTU
Next by thread: MTU
Index(es):
- Date
- Thread