Sounds similar to my problem with the Linksys cable/DSL router.
My problem was that it would work perfectly with NAT enabled, but
the minute I turned NAT off, I couldn't get to a lot of sites.
I tried a number of firmwares. I even tried to get support from
Linksys. But, after a week without any r
we used to have that problem here. a big customer from us does
many gre tunnels. the problem seemed to be that they were blocking
icmp, thus every mtu variation on the way from any point could not be
known by the routers making the point unavailable (we actually saw
the packets just before ent
ECTED]]
Sent: Tuesday, January 21, 2003 2:36 PM
To: Mark J. Scheller
Cc: [EMAIL PROTECTED]
Subject: Re: Stumper
On Tue, 21 Jan 2003, Mark J. Scheller wrote:
:: Here's the particulars:
::
:: Users that have Verizon DSL and a Linksys cable/DSL router have
:: difficulties accessing sites on
On Tue, Jan 21, 2003 at 08:06:07PM -0500, hc wrote:
>
> MTU on user-end shouldn't really be an issue here.. B/c if so, then (I
> am only assuming this) how could they access other sites like yahoo.com,
> etc? I am sure your web site is no different than other common ones.
Well, you're forgetti
MTU on user-end shouldn't really be an issue here.. B/c if so, then (I
am only assuming this) how could they access other sites like yahoo.com,
etc? I am sure your web site is no different than other common ones.
Linksys routers have various issues. The best bet is to go after the
firmware and
MTU on the PC's
-Original Message-
From: Mark J. Scheller [mailto:[EMAIL PROTECTED]]
Sent: 2003-01-21, Tuesday 5:45 PM
To: [EMAIL PROTECTED]
Subject: Re: Stumper
The Linksys does have an MTU setting, and I've had my users try some lower
settings to see if it made any d
On Tue, 21 Jan 2003, Mark J. Scheller wrote:
> The Linksys does have an MTU setting, and I've had my users try some lower
> settings to see if it made any differences. One user set the MTU on the
> Linksys as low as 1200 with no noticeable improvement.
If you're using path MTU discovery (in oth
This would depend upon the direction of the packets that are dropped and where
the broken device is.
If the 1500 byte packets are coming in from the Internet and the Linksys needs
to forward onto a smaller MTU media but finds the DF bit set it will return an
icmp fragment.. if this icmp is then d
If the MTU is not helping then go get the latest firmware. Also you
cannot use port forwarding in most linksys routers with DHCP enabled.
For those routers you have to set everyone statically and turn of DHCP
for port forwarding to work.
Mark J. Scheller wrote:
The Linksys does have an MTU s
On Tue, 21 Jan 2003, Mark J. Scheller wrote:
:: Here's the particulars:
::
:: Users that have Verizon DSL and a Linksys cable/DSL router have
:: difficulties accessing sites on my network -- whether they are trying
:: with http, https, smtp, pop3, ssh, ftp, etc., etc. Oh, but pings
:: seem to b
The Linksys does have an MTU setting, and I've had my users try some lower
settings to see if it made any differences. One user set the MTU on the
Linksys as low as 1200 with no noticeable improvement.
Anything else I should look at?
mS ([EMAIL PROTECTED])
OTECTED]]On Behalf Of
> Mark J. Scheller
> Sent: Tuesday, January 21, 2003 5:26 PM
> To: [EMAIL PROTECTED]
> Subject: Stumper
>
>
>
>
> I have run into a problem that has me completely stumped, so I'm
> tossing it
> out to NANOG for some help.
>
> Before I la
(I think that is the right value) seemed to clear things
up.
Ray Burkholder
-Original Message-
From: Mark J. Scheller [mailto:[EMAIL PROTECTED]]
Sent: January 21, 2003 18:26
To: [EMAIL PROTECTED]
Subject: Stumper
I have run into a problem that has me completely stumped, so
I&#
Could this be a packet size issue ?
You might try
ping -s
and see if, say, 1500 byte and 4500 byte packets get through.m
On Tuesday, January 21, 2003, at 05:25 PM, Mark J. Scheller wrote:
I have run into a problem that has me completely stumped, so I'm
tossing it
out to NANOG for some hel
; To: [EMAIL PROTECTED]
> Subject: Stumper
>
>
>
>
> I have run into a problem that has me completely stumped, so
> I'm tossing it out to NANOG for some help.
>
> Before I lay out the specifics, I'm not trying to point
> fingers at any particular ISP or vend
Are there sub-1500 byte MTUs anywhere and is one of the devices
(Linksys?) dropping the relevant icmp fragments?
Morpheus might be working by not having DF bit set..
just a possibility
test by removing any filtering of icmp
Steve
On Tue, 21 Jan 2003, Mark J. Scheller wrote:
>
>
> I have
MTU
I have run into a problem that has me completely stumped, so I'm tossing it
out to NANOG for some help.
Before I lay out the specifics, I'm not trying to point fingers at any
particular ISP or vendor here, but this problem only exhibits itself in very
specific configurations. Unfortunately, the
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