Hi can anyone help me please. Since being migrated I have been unable to connect to certain websites. The Orange technical help is absolutey bloody awfull and I have already asked for my MAC but that still doesn't help me now. It is not a DNS issue and it affects any PC which I happen to connect to my router. Having read the articles on MTU I checked this last night. But using www.google.co.uk which I could connect to and pinging it while reducing the packet size with the do not fragment flag set, I get a reply at 1472, which if you add the header and footer overhead back on gives 1500, the default setting in most situations. If I choose a site that I can't connect to (or ping) and reduce the packet size to say 1400 I still get no reply so I don't think it is an MTU issue - unless the size of the outgoing packet is unrelated to the reply (by which I mean that the web server may be receiving the ping echo request but still replying with packets that are too large for a certain router on the return journey). I'm using a DG814 modem/router if that makes any difference. My next step is going to have to be to dig out the Orange box and waste time seeing if that can connect.
By the way how many people got a phone call from Orange offering to save you about a quid a month in the month before you were llu 'd. Luckily for me I didn't say yes as this would have actually meant being committed to another 12 months contract and leaving Orange to mess me about during llu, safe in the knowledge that I couldn't leave.
You need to set both then test. For each MTU setting there could be several RWIN settings to choose from for best performance......so it can be trial and error before you hit on the best combination.
The problem is that I can't connect to certain websites. The theory that I was checking is that certain websites do check the largest MTU that any router in the path will accept AND that one or more routers is throwing away packets of say 1473 or greater. But this does not seem to be the case as when I checked this as described above using PING, the packet size doesn't make any difference - I just can't PING www.BT.com whatever size packets I use but I can PING www.google.com.
I have two computers connected to my router & both suffer the same problems.
Orange try to be helpful, but are not.
Is this a packet size related issue? Things were working fine until this week. I've tried rebooting both computers and the router, but that didn't help.
If it is packet size related then how to I reduce the maximum packet size (on windows XP and on Vista)?
I found the day I was LLU'd google was about the only page I could load also (probably cos it doesn't have much on it). This was despite having already set my MTU to 1430 with appropriate RWIN setting to improve performance when I was on ADSLMax (and boy that did make a difference)
If Martin Dennett is using a livebox and has access to another router, this may help slightly, although in my case I was experiencing the above with my Netgear, and the livebox wouldn't even synch with the exchange
_________________ Ex Orange Customer
Now the future definately is bright
I've had this problem. I have 2 computers, each connected separately to the livebox and both are sometimes denied access to certain sites. I've been through the MTU/RWIN issue and I don't think it is this.
I have narrowed it doen to the livebox and found that by logging in and simply disconnecting it and then reconnecting the problem is solved.... temporarily. Because a week later I'll have to do the same thing. I'm thinking the livebox is issued with some kind of update and this triggers the problem.
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