[144784] in North American Network Operators' Group
Re: SDH Fiber Problem
daemon@ATHENA.MIT.EDU (Leigh Porter)
Mon Sep 19 04:16:21 2011
From: Leigh Porter <leigh.porter@ukbroadband.com>
To: jacob miller <mmzinyi@yahoo.com>
Date: Mon, 19 Sep 2011 08:17:28 +0000
In-Reply-To: <1316420052.39155.YahooMailNeo@web39501.mail.mud.yahoo.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
It does sound like an MTU issue. Symptoms are typical. Did you try pings e=
nd to end with DF bit set and full size datagrams?
--=20
Leigh Porter
On 19 Sep 2011, at 09:15, "jacob miller" <mmzinyi@yahoo.com> wrote:
> By meanigful traffic I mean traffic like Http traffic
>=20
> Am able to ssh no problem.
>=20
> Most of the clients on the link are using it for browsing.
> However we find that even though they are able to resolve and ping diffe=
rent sites.
> When it comes to opening of the page we have the page reading as opening=
opening .. but the page never gets opened.
>=20
> Regards,
> Jacob Miller
>=20
>=20
>=20
> ----- Original Message -----
> From: Leigh Porter <leigh.porter@ukbroadband.com>
> To: jacob miller <mmzinyi@yahoo.com>
> Cc: "nanog@nanog.org" <nanog@nanog.org>
> Sent: Monday, September 19, 2011 11:10 AM
> Subject: Re: SDH Fiber Problem
>=20
> What exactly do you mean by meaningful traffic? ICMP from port to port w=
orks, can you pass TCP? SSH between routers? Establish a TCP session over =
it?
>=20
> Are you using Juniper SRXs ? :-)
>=20
> --=20
> Leigh Porter
>=20
>=20
> On 19 Sep 2011, at 08:24, "jacob miller" <mmzinyi@yahoo.com> wrote:
>=20
>> I have tried the pings and am able to ping through with a size of 1600 =
with the df-bit set
>>=20
>> without the df-bit am able to get up to 9000.
>>=20
>> The switched on bot ends hav been set to allow jumbo frames through and=
the system MTU size and routing MTU sizes are at 1998.
>> The switch is a 2960 Cisco switch.
>>=20
>> I have set the mtu on the interface on the end router to 1600 and still=
unable to push meaningful traffic.
>>=20
>> Regards,
>> jacob Miller
>>=20
>>=20
>>=20
>> ----- Original Message -----
>> From: Randy Bush <randy@psg.com>
>> To: jacob miller <mmzinyi@yahoo.com>
>> Cc: "nanog@nanog.org" <nanog@nanog.org>
>> Sent: Monday, September 19, 2011 9:55 AM
>> Subject: Re: SDH Fiber Problem
>>=20
>>> I can ping on point to point
>>> I have BGP up and running
>>> When I try to pass traffic over the link my clients are unable to pass=
>>> any meanigful traffic asn browsing is impossible.
>>=20
>> mtu? try various size pings.
>>=20
>> filters?
>>=20
>> randy
>>=20
>>=20
>>=20
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>=20
>=20
>=20
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