As the name implies, MTU refers to the largest data packet that can be carried over your network pipe. MTU is measured in bytes, so a setting of "1600" would equal roughly 1.5 KB per packet.

Reading through the documentation I have been able to find, the gigabit service they provide is not done using any type of DSL. So I believe I should be able use only my pfsense box to authenticate using PPPoE on the WAN interface. Also, I should have stated in my original email I am running the current release of pfsense (2.2.2). If the packet was too large you will get the message: "Packet needs to be fragmented but DF set" (with 100% packet LOSS). Reduce the buffer size until you are successfully connected. TIP: Add 28 to that number, and the result will be the value being set to SonicWall "Interface MTU". Changing the MTU settings on the SonicWall appliance M hint: Select Path MTU Discovery strategy. may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment locally when packet size is large), or dont (do not set DF flag). s packet_size: Specifies the number of data bytes to be sent. You should always start at 1472 and work your way down by 10 each time. MTU settings do not affect lag. If your connection lags, it will lag on any setting. High MTU values will mean that data packets are bigger, so if something goes wrong, there's more data to resend, causing lag. Then you need to click the Ethernet tab and set the MTU value before saving and reconnecting on the link. Check My MTU. The output of ifconfig should show you your MTU for your various network interfaces as shown below: Testing. I found the easiest way to check that my MTU was working was to use tracepath like so: tracepath [server IP]

There are two ways of changing the MTU size: on your router or within your computer’s settings for the built-in network card. My router doesn’t actually allow me to change the MTU Size; my ISP has determined what they believe to be the best size and set that for me.

Dec 29, 2015 · Then, click Detect to start MTU path discovery. If the test is successful, the recommend MTU size will be displayed. 3. Click Accept to apply it to MTU setting, and click OK to save. Use Ping command. For routers that don't support Path MTU Discovery, we can find the proper MTU by sending ping requests from a PC behind the router. Changing MTU value on the Nintendo Wii – see towards the bottom of this page for a guide on how to manually set the MTU value for the Wii. Changing MTU value on the Nintendo 2DS/3DS models – see this quick guide. MTU cannot be changed on the Xbox One directly; it needs to be changed on the main router instead. Nov 28, 2016 · In the MTU Size field, enter a value from 64 to 1500. Click the Apply button. Your change is saved. If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to experiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes away.

Generally, if your MTU is too large for the connection, your computer will experience packet loss or dropping internet connection. This article will help you determine and set up the correct MTU size. To know how, follow the steps below: i. Determining the correct MTU size ii. Setting up the correct MTU size Determining the correct MTU size Nov 28, 2016 · Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting. For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting. Change the MTU on the routers WAN Setup. In the cases where IPsec is being used, it is customary to set the MTU size on the tunnel interfaces to 1400 bytes and to set the TCP-MSS-adjust to 1360 bytes. This can be configured in a Cisco