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17
votes
2answers
8k views

What is the “in-the-wire” size of a ethernet frame? 1518 or 1542?

According to the table here, it says that MTU = 1500 bytes and that the payload part is 1500 - 42 bytes or 1458 bytes (<- this is actually wrong!). Now on top of that you have to add IPv4 and UDP ...
2
votes
4answers
2k views

How to check who blocks ICMP during MTU path negotiation?

I am getting MTU problems with connections to my web host provider. The issue is that I am behind ppoe with MTU size set to 1492 which preventing me from using 'scp'. Once changing MTU from 1492 to ...
15
votes
2answers
2k views

Why does lowering the MTU from 1500 to 1499 allow me to access most websites?

I had this issue where I was only able to connect to websites like google.com and ibm.com when the mtu was set at 1500, but if I tried to connect to anything else, it would just show a blank page. ...
3
votes
3answers
9k views

How to increase MTU size on Linux 2.6?

How to increase MTU size on Linux 2.6? Is such a thing possible? If yes, which files (in /etc or elsewhere) must one edit?
2
votes
1answer
409 views

OpenVPN: How to mitigate path MTU issues on a per-client basis?

We have dozens of embedded devices installed at customers, all calling home to our OpenVPN service. That works fine in general, but a few of our customers have severe path MTU issues. Our influence on ...
4
votes
3answers
931 views

What is the Maximum MTU supported in DSL Standards

Do any of the ITU DSL standards limit the maximum MTU that can be supported? I know that RFC2516 (PPPoE) limits the MTU to 1492 bytes; however when PPPoE is not used this limit should not exist. The ...
2
votes
1answer
95 views

Maximum MTU size

Thought one of the issues I'm experiencing with the following question is due to MTU rightfully so. ESXi 5 VM Putty session hangs, vSphere client timing out However, when I tried testing the ...
2
votes
1answer
901 views

other than manually changing it, how is MTU set?

I recently discovered a Windows 7 client that couldn't connect to one of our servers. It turned out the problem was both that the server was set for an MTU of 1514 and that the client was set to 1504. ...
0
votes
0answers
23 views

Right way to set the MTU of an IPsec Client ( Linux/Racoon)

Here's the network topology : (PC1:IPsec Client)eth0---Internet CPE---((Internet))---Internet CPE---(PC2:IPsec Server) I've set up an IPsec Internet Gateway : PC1 sends all traffic, encrypted in an ...
0
votes
2answers
221 views

What should be the MTU Size for Windows Servers on the same Network

I have two windows servers on the same network, communicating to each other. What would be the best way to come up with the MTU setting?