Intermittent DSL connection problems

[DelJo63]

On my Netgear, the MTU is on the WAN setup.

Question: How to determine the right MTU value for your ISP access?
MTUs are multiples of 8 bytes, the largest being 1500. SO, we test

• ping -l 1500 -f 8.8.8.8

reducing the 1500 by 8 until it stops reporting

Pinging 8.8.8.8 with 1500 bytes of data:
Packet needs to be fragmented but DF set.
​

That will be the best value for you.

 

[learninmypc]

 

[DelJo63]

Ping -l (1500-x*8) -f 8.8.8.8
fine, redo with X = {1,2,3,4,5...} until it's correct
ping -l 1492 -f 8.8.8.8
ping -l 1484 -f 8.8.8.8
ping -l 1476 -f 8.8.8.8
...

 

[learninmypc]

Ok, I'm supposed to be using X8.8.8..8? if so, I'm not get

 

[DelJo63]

Look at this sequence and continue the pattern - - -
ping -l 1492 -f 8.8.8.8
ping -l 1484 -f 8.8.8.8
ping -l 1476 -f 8.8.8.8

 

[learninmypc]

Ok, I was copy/pasting your numbers from the previous post, what part of this ping -l 1484 -f 8.8.8.8 do I type in?

 

[learninmypc]

I should also probably mention the other computer in the house on ethernet was not affected that I know of.

 

[DelJo63]

Hmm; COPY/PAST each line as shown - - the whole thing

 

[learninmypc]

Ok, will do

 

[learninmypc]

Look at this sequence and continue the pattern - - -
ping -l 1492 -f 8.8.8.8
ping -l 1484 -f 8.8.8.8
ping -l 1476 -f 8.8.8.8

 

[DelJo63]

Keep going!!! subtract 8 from the last value used and iterate.

ping -l 1476 -f 8.8.8.8
        ^^^^

 

[learninmypc]

Is this correct

 

[DelJo63]

Yes, that shows all the ping options

• -l nnn sets the size of the packet to be send, in this test, NNN is > 8 and <=1500
• -f disallows fragmentation

so the normal ping 8.8.8.8 becomes ping -l nnn -f 8.8.8.8

 

[learninmypc]

So does that mean I'm done, or ?

what? I will be AFK after noon PDT

 

[DelJo63]

Sorry man, the options clearly show -l requires a number. NNN is representational of NUMBERS.

Start with a number of 1500, reducing by 8 until

Packet needs to be fragmented but DF set.​

does not appear. THAT'S the MTU you want to use.

Reply WHEN and IF you get that result :sigh:

 

[learninmypc]

This just now happened so I grabbed a screenshot

 

[learninmypc]

For the above post & this one, I'm using my iPad. I'm wondering if I should go back to wireless on my w7.
Why is only my pc affected by this & not the other one in the bldg?

 

[DelJo63]

Even the Wifi takes the path, PC--> WiFi (or wired) ---> Router ---> Modem ---> ISP

The PPoE indicts the modem/ISP connection so imo, it will happen regardless of wifi/wired.

 

[learninmypc]

Ok, but I'd still like to know why its ONLY my W7 computer & not the other one on the same router?? Not to mention my iPhone & iPad are on the same router & they're always online.

 

[learninmypc]

@jobeard is there an answer for question in above post?

 

[DelJo63]

IMO, you need to set set the MTU

 

[learninmypc]

Got this twice in a row as always

 

[DelJo63]

You are using -1 (one) instead of -l (letter l) :grin:

 

[learninmypc]

Are you saying its supposed to L but small? I thought it was a one 1

 

[learninmypc]

Using the small L (l) *I get this