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Can anyone suggest the best MTU to use with EPB WAN?

2018-04-05 by: Lynn Dixon
From: Lynn Dixon 
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I am tuning my pfsense setup, and figured I would tune the MTU for the WAN
interface.  Currently its the default of 1500, and I was wondering if there
was a more optimal setting that should be used with EPB 1 gig service.

Any suggestions on tuning?
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=============================================================== From: Phil Sieg ------------------------------------------------------ Lynn, I would be interested in your final tune settings is you would be = willing to share=2E=C2=A0 I am on epb at work and home with pfSense boxen i= n both places=2E=C2=A0 =E2=81=A3Phil Sieg Founder ring-u llc www=2Ering-u= =2Ecom=C2=A0 phil@ring-u=2Ecom Phone:=C2=A0423=2E567=2E4888 Mobile:=C2=A04= 23=2E331=2E0725 "The computer is the most=C2=A0remarkable tool that we've = ever=C2=A0come up with=2E It's the equivalent=C2=A0of a bicycle for our min= ds=2E" Steve Jobs, 1955-2011=E2=80=8B On Apr 5, 2018, 10:07 AM, at 10:07 = AM, Lynn Dixon wrote: and figured I would tune the MTU for the the default of 1500, and I was wondering if ting that should be used with EPB 1 gig service=2E ning? --------

=============================================================== From: Mike Harrison ------------------------------------------------------ Once upon a time: 768 was a magic number. It really depends on most of=20 your traffic and usage. Run Statistics in "iptraf" while you do some common usage, and see what=20 most of your traffic looks like. This is me hitting two common web interfaces I use: IPTraf =E2=94=8C Packet Distribution by Size=20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 =E2=94=82 = =20 =E2=94=82 =E2=94=82 Packet size brackets for interface eth0 = =20 =E2=94=82 =E2=94=82 = =20 =E2=94=82 =E2=94=82 = =20 =E2=94=82 =E2=94=82 Packet Size (bytes) Count Packet Size (bytes) Count = =20 =E2=94=82 =E2=94=82 1 to 75: 1384 751 to 825: 2 = =20 =E2=94=82 =E2=94=82 76 to 150: 500 826 to 900: 3 = =20 =E2=94=82 =E2=94=82 151 to 225: 156 901 to 975: 10 = =20 =E2=94=82 =E2=94=82 226 to 300: 89 976 to 1050: 3 = =20 =E2=94=82 =E2=94=82 301 to 375: 59 1051 to 1125: 3 = =20 =E2=94=82 =E2=94=82 376 to 450: 37 1126 to 1200: 3 = =20 =E2=94=82 =E2=94=82 451 to 525: 18 1201 to 1275: 8 = =20 =E2=94=82 =E2=94=82 526 to 600: 39 1276 to 1350: 8 = =20 =E2=94=82 =E2=94=82 601 to 675: 10 1351 to 1425: 238 = =20 =E2=94=82 =E2=94=82 676 to 750: 16 1426 to 1500+: 551 = =20 =E2=94=82 =E2=94=82 = =20 =E2=94=82 =E2=94=82 = =20 =E2=94=82 =E2=94=82 Interface MTU is 1500 bytes, not counting the data-link header = =20 =E2=94=82 =E2=94=82 Maximum packet size is the MTU plus the data-link header length = =20 =E2=94=82 =E2=94=82 Packet size computations include data-link headers, if any = =20 =E2=94=82 =E2=94=82 = X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KQ2h1Z2FsdWcg bWFpbGluZyBsaXN0CkNodWdhbHVnQGNodWdhbHVnLm9yZwpodHRwOi8vY2h1Z2FsdWcub3JnL2Nn aS1iaW4vbWFpbG1hbi9saXN0aW5mby9jaHVnYWx1Zwo=

=============================================================== From: Dave Brockman ------------------------------------------------------ Unless you are ONLY going to talk to other EPB nodes, and not anywhere off their network, you should leave it at 1500, otherwise, you are just going to cause yourself issues. Regards, dtb P.S. Lynn, sorry for the double-post.