MTU (Maximum Transfer Unit) refers to the largest size of the datagram that a layer of a communication protocol can transmit.

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How will affect MTU through different hosts?

I had issues with my new ISP, and I found that it has something to do with the MTU. This is the actual setup: Client, Win7 with jumbo frames, 9000 MTU Linux box: on the local side, a network card ...
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56 views

Throughput decreases after MTU 5000

I am trying to test throughput between two computers directly connected through 1 GbE and testing with iperf. I am getting a throughput around 980Mbps when MTU is between 5000 and 5050, however it ...
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201 views

No computer on network can play YouTube videos

I have a Netgear FVG318v1 router and all computers on the network cannot play any YouTube videos. I have tried with 3 computers, PC and Mac with all different kinds of browsers. All I get from YouTube ...
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54 views

Drop IP fragments of a certain protocol

When conntrack is active, the iptables stack never sees a fragmented IP packet, only the reassembled one (source), so the -f test never matches. If I want to block any fragment I could set ...
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933 views

Windows 7 doesn't request MTU from DHCP server; what is it thinking?

My computer's Ethernet adapter uses 1,500 byte Ethernet frames. Normally this means that my Local Area Connection's MTU is 1500 bytes. But my (IPv4) connection to the Internet has some overhead. This ...
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26 views

Set an ipv6-specific MTU

I have a router which has ipv6 connectivity through a tunneling mechanism. The router announces a prefix in the LAN, and clients get native ipv6 connectivity on their point of view. The MTU of the LAN ...
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2answers
140 views

Configure HP iLO MTU Setting - Site is behind several firewalls and MTU requires lowering for access

Just wondering if anyone knows how to adjust the MTU setting for a HP server iLO NIC? The site is behind several firewalls and we have had problems with other things that has required us to lower the ...
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851 views

Changing MTU on Windows 8

have tried several times to change the mtu on my windows 8 hp laptop, have used the method shown here- ...
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155 views

Why does postfix take so long time to receive emails from gmail?

How can I manually check for an email from the command line? How can I force postfix to receive/update emails? The email from gmail takes 8 minutes till it will be received by postfix. How can I ...
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What is the relation between interface MTU and received packets length?

Let's say that two hosts A and B communicate via an Ethernet medium. Host A has MTU 1500 and host B has MTU 1300. If A is sending a packet with length 1500, will host B receive it?
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how to set MTU value in windows xp

I wish to change the MTU value on my pc (XP) i tried some registry mathods- added some values in several places: (this one is a windows tutorial) ...
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5k views

TP Link wireless router connects but web pages do not load

i have recently purchased TP-Link TL-WR740N but somehow it is not working properly. I do not have ISP connection rather i have fixed IP connectivity so that i get a 100Mbps ethernet cable coming for ...
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How to configure a large mtu (linux)

I have a gigabit ethernet connection from my laptop to my router, and a working ipv6 connection to the internet. I can receive very large packets from sites on the internet, with sizes up to at least ...
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252 views

Why might my HP C7200 printer appear to have an MTU of 1498?

On my wireless network, I can tracepath to a mac using MTU of 1500 on Ubuntu linux 12.04. (Mac MTU is set to 1470 for some reason, but reply frames are not that big so this does not matter) When I ...
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924 views

OS X Failure in Path Maximum Transmission Unit (PMTU) Black Hole Router Detection

This all started when I was trying to download a podcast on my Mac. This happens in both Snow Leopard and Lion when the Ethernet interface is set to use Jumbo Frames. prompt> curl -v -o x.mpg ...
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342 views

Unable to remotely connect to a machine after succesfull VPN login

I'm unable to remotely connect to a virtual machine even after successfully logging into VPN through my broadband connection. Weird it is, I'm able to remotely connect to that machine after VPN log in ...
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472 views

DF bit in Apache to Tomcat communication

Edited (edits are in italics): In my configuration I have an Apache 2.2 Http Server configured as a reverse proxy *with mod_proky_jk*, that exposes http service from an Apache Tomcat 6 application ...
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755 views

Timeout while testing MTU via ping

I tested it on Windows 7 and Ubuntu 11.10 with MTU size 1500B. IP packet - 20B ICMP packet - 8B 1500 - 28 = 1472 So maximum packet that I could ping without fragmentation is 1472B, and this is ...
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Can't access some websites, possible MTU issue on the router?

Two particular sites that I can't access at all is css-tricks.com and jquery.com which are pretty crucial to me since I'm a web designer. I talked with my ISP and we tried Using different ...
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What is the most MTU efficient way of creating a network tunnel?

I am currently using SSH tunneling to connect to the internet via a remote computer using the -D ssh argument. I've recently run across a problem with this solution -- the SSH protocol decreases the ...
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680 views

MTU setting ignored by Java socket on loopback

I've got a mtu problem. I did the following: root@sa-headend:/home/sa# ifconfig lo mtu 1500 root@sa-headend:/home/sa# ifconfig lo lo Link encap:Lokale Schleife inet ...
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About MTU settings in machines and switch

Update: to be more realistic: M1 Switch and M2 are all running on a 10G network, and we use ipv4. The settings are: M1 has MTU set to 1500 Switch has MTU set to 9000 M2 has MTU set to 9000 Does ...
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874 views

What layer does ifconfig operate at?

What layer does ifconfig operate at when setting a MTU. Does it set the MTU for the physical device (Network Interface Layer) or the MTU of the packet (Internet Layer)? By executing ifconfig eth0 ...
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Macbook Pro 2010 Ethernet Jumbo Frame(9k MTU) Support?

Has anyone been able to use jumbo frame support on their 2010 Macbook Pros? This is kind of negative news here, but I am seeing many reports that this is not available anymore due to Apple's choice ...
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Why does Mac OS X insist on changing my MTU to 1500?

Recently (I think after updating to 10.6.4) Mac OS X has insisted on changing my MTU to 1500, even though the router which my Mac connects to directly has an MTU of 1472. I've noticed that manually ...
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How to tell what MTU is being used in Windows XP

I'm suffering from a really weird problem where I randomly get "The connection to the server was reset" errors when trying to access web pages (HTTP error 12031 according to the Windows network ...