[145072] in North American Network Operators' Group
Re: SDH Fiber Problem
daemon@ATHENA.MIT.EDU (jacob miller)
Tue Sep 27 03:16:38 2011
Date: Tue, 27 Sep 2011 00:15:31 -0700 (PDT)
From: jacob miller <mmzinyi@yahoo.com>
To: "nanog@nanog.org" <nanog@nanog.org>
In-Reply-To: <82933B17-9992-47FB-8472-3F5112F118E2@ukbroadband.com>
Reply-To: jacob miller <mmzinyi@yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
=0A=0AManaged to solve this problem.=0A=0AIt was MTU related as my routers =
had an MTU size set at 1600.=0A=0ARemoved this setting from both ends and m=
anaged to get traffic flowing.=0A=0AHad earlier terminated a laptop at one =
end of the link just to test and found I was able to push more than 20MB.=
=0A=0AThanks for your assistance on this.=0A=0ARegards,=0AJacob Miller=0A=
=0A=0A----- Original Message -----=0AFrom: Leigh Porter <leigh.porter@ukbro=
adband.com>=0ATo: jacob miller <mmzinyi@yahoo.com>=0ACc: "nanog@nanog.org" =
<nanog@nanog.org>=0ASent: Monday, September 19, 2011 11:17 AM=0ASubject: Re=
: SDH Fiber Problem=0A=0AIt does sound like an MTU issue. Symptoms are typi=
cal. Did you try pings end to end with DF bit set and full size datagrams?=
=0A=0A=0A=0A-- =0ALeigh Porter=0A=0A=0AOn 19 Sep 2011, at 09:15, "jacob mil=
ler" <mmzinyi@yahoo.com> wrote:=0A=0A> By meanigful traffic I mean traffic =
like Http traffic=0A> =0A> Am able to ssh no problem.=0A> =0A> Most of the =
clients on the link are using it for browsing.=0A> However we find that eve=
n though they are able to resolve and ping different sites.=0A> When it com=
es to opening of the page we have the page reading as opening opening .. bu=
t the page never gets opened.=0A> =0A> Regards,=0A> Jacob Miller=0A> =0A> =
=0A> =0A> ----- Original Message -----=0A> From: Leigh Porter <leigh.porter=
@ukbroadband.com>=0A> To: jacob miller <mmzinyi@yahoo.com>=0A> Cc: "nanog@n=
anog.org" <nanog@nanog.org>=0A> Sent: Monday, September 19, 2011 11:10 AM=
=0A> Subject: Re: SDH Fiber Problem=0A> =0A> What exactly do you mean by me=
aningful traffic? ICMP from port to port works, can you pass TCP? SSH betwe=
en routers? Establish a TCP session over it?=0A> =0A> Are you using Juniper=
SRXs ? :-)=0A> =0A> -- =0A> Leigh Porter=0A> =0A> =0A> On 19 Sep 2011, at =
08:24, "jacob miller" <mmzinyi@yahoo.com> wrote:=0A> =0A>> I have tried the=
pings and am able to ping through with a size of 1600 with the df-bit set=
=0A>> =0A>> without the df-bit am able to get up to 9000.=0A>> =0A>> The sw=
itched on bot ends hav been set to allow jumbo frames through and the syste=
m MTU size and routing MTU sizes are at 1998.=0A>> The switch is a 2960 Cis=
co switch.=0A>> =0A>> I have set the mtu on the interface on the end router=
to 1600 and still unable to push meaningful traffic.=0A>> =0A>> Regards,=
=0A>> jacob Miller=0A>> =0A>> =0A>> =0A>> ----- Original Message -----=0A>>=
From: Randy Bush <randy@psg.com>=0A>> To: jacob miller <mmzinyi@yahoo.com>=
=0A>> Cc: "nanog@nanog.org" <nanog@nanog.org>=0A>> Sent: Monday, September =
19, 2011 9:55 AM=0A>> Subject: Re: SDH Fiber Problem=0A>> =0A>>> I can ping=
on point to point=0A>>> I have BGP up and running=0A>>> When I try to pass=
traffic over the link my clients are unable to pass=0A>>> any meanigful tr=
affic asn browsing is impossible.=0A>> =0A>> mtu?=A0 try various size pings=
.=0A>> =0A>> filters?=0A>> =0A>> randy=0A>> =0A>> =0A>> =0A>> _____________=
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