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Topic: MTU (networking)

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	Cisco - Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC
		Since the MTU of the GRE tunnel is 1476, the 1500-byte packet is broken into two IP fragments of 1476 and 44 bytes, each in anticipation of the additional 24 byes of GRE header.
		The media MTU is based on the MTU of the outbound router interface and the PMTU is based on the minimum MTU seen on the path between the IPsec peers.
		The outgoing physical MTU is 1500, the IPsec PMTU is 1500, and the GRE IP MTU is 1476 (1500 - 24 = 1476).
	www.cisco.com /warp/public/105/pmtud_ipfrag.html (8968 words)

	MTU - EnterpriseNetworkingPlanet - News, trends and advice for network managers
		Ideally, you want the MTU to be the same as the smallest MTU of all the networks between your machine and a message's final destination.
		For example, the MTU of many PPP connections is 576, so if you connect to the Internet via PPP, you might want to set your machine's MTU to 576 too.
		Most Ethernet networks, on the other hand, have an MTU of 1500, which is the default MTU setting for Windows 95.
	networking.webopedia.com /TERM/M/MTU.html (281 words)

	Adjusting the MTU
		MTU problems may result in degraded network service, but may not affect some users' abilities to access the required applications, so sometimes MTU problems go unreported.
		Note that, by default, the MTU on Windows operating systems is 1500 (Ethernet) and that a change to 1492 may resolve some, but not all, problems.
		The MTU must be set to the same setting on all your PC NICs and router.
	help.expedient.net /broadband/mtu.shtml (665 words)

	Maximum transmission unit - Wikipedia, the free encyclopedia
		The MTU may be fixed by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-to-point serial links).
		While a host will know the MTU of its own interface and possibly that of its peer (from initial handshakes) it will not initially know what the lowest MTU on the link is and in any case a higher protocol design may require packets of a size larger than the network links support.
		With an MTU of 1492 bytes, the grand total is 1536 bytes, and this is exactly 32 ATM cells of 48 byte payload each.
	en.wikipedia.org /wiki/MTU_(networking) (900 words)

	broadband help » Forums » Networking » [Other] MTU quandry!
		MTU is generally set dynamically, however to optimise the network you can manually correct the issue...
		However, when the packet is moving to google that MTU may actually change by another device (such as a VPN) and drop the MTU to 1300.
		The issue with MTU is that you want to get the maximum amount of data in each packet to minimize the effect of packet overhead.
	www.dslreports.com /forum/remark,17438238 (2174 words)

	maximum transmission unit (MTU) (Site not responding. Last check: 2007-11-06)
		The Maximum Transmission Unit (MTU) is the largest size of IP datagram which may be transferred using a specific data link connection The MTU value is a design parameter of a LAN and is a mutually agreed value (i.e.
		If however, a router finds that the MTU of the next link exceeds the packet size and the DF flag is set, this tells the router not to segment the packet.
		Fragments are not reassembled by an IS - i.e.
	www.erg.abdn.ac.uk /users/gorry/course/inet-pages/mtu.html (1050 words)

	Windows MaxMTU Fix - HelpWithWindows.com
		The Maximum Transmission Unit of a network is the greatest amount of data or "packet" size that can be transferred in one physical frame on that network.
		MTU is normally set in conjunction with MSS, the Maxmum Segment Size, and RWIN, the TCP Receive WINdow, now renamed to TCP Receive Window in Windows XP.
		An MTU of 576 used to be the most common MTU setting in use and was generally referred to as the "Internet Standard".
	www.helpwithwindows.com /techfiles/maxmtu.html (1922 words)

	Raising the Internet MTU
		We are proposing that the Internet needs to support diverse MTUs (path MTU discovery [RFC1191, RFC1981] has to work better) and that the user community has to demonstrate sufficient demand for large MTUs to support a market for appropriate hardware.
		The problem is so severe that there is significant resistance in the IETF to tunneling protocols because they result in MTU's that are slightly smaller than standard Ethernet, leading to either pervasive IP fragmentation or the risk of connection hangs due to failed path MTU discovery.
		If path MTU discovery had been working well in 1990, it would have been obvious that FDDI (4352 bytes) outperforms 1500 byte Ethernet, and there would have been 12 years of market pressure to push up the Internet MTU.
	www.psc.edu /~mathis/MTU (1014 words)

	Path MTU Discovery and Filtering ICMP (Site not responding. Last check: 2007-11-06)
		If there is some MTU between the two hosts which is too small to pass the packet successfully, then an ICMP can't fragment error will be sent back to the source.
		If you reduce the MTU on the system trying to do path MTU discovery to a point where it is less than or equal to the former path MTU, it will no longer try sending packets large enough to cause problems.
		Since many networks filter incoming traffic from such reserved addresses, the net result is the same as if all ICMP were being filtered and can cause the same problems.
	alive.znep.com /~marcs/mtu (1308 words)

	What is MTU?
		The MTU (Maximum Transmission Unit) is the size of the largest datagram that can be sent over a network.
		Most network technologies have default MTU sizes which may be changed by the network administrator.
		The term PMTU (Path MTU) is sometimes used to describe the MTU along an entire network path.
	www.tech-faq.com /mtu.shtml (97 words)

	Network Policy (Site not responding. Last check: 2007-11-06)
		This note is just reminder that dorm room connections to the MTU Network fall under the same rules and regulations in effect for the entire network.
		Individuals using MTU's network are subject to having some or all of their activities monitored or recorded by systems personnel.
		Observe Peak Utilization constraints: Peak network utilization times are between 2:00 PM and 5:00 PM every day and at all times during the last 3 weeks of the term.
	www.csl.mtu.edu /www/lab.info/network.policy.html (434 words)

	MTU Data Network Architecture & Features
		Networking connections on campus range from 1 Megabit DSL to 10 Gigabit Ethernet.
		Departments are assigned networks that are managed by their systems administration staff.
		MTU was an earlier pioneer in IPv6, we have used IPv6 addressing since 2000.
	www.tc.mtu.edu /data/architecture (788 words)

	MTU Career Center, Job Fair Success
		Fourth, if your ideal company is hiring computer technicians and you want to work in accounting, do still interview with the company at the fair, being sure to leave the interview with the contact information of the person responsible for hiring in that area; don't be discouraged and walk away.
		Of course, you are building a network with the recruiters - this task is your most vital.
		However, you can also network with your fellow job-seekers in terms of sharing information about job leads, companies, and their recruiting strategies and styles.
	www.ucc.mtu.edu /students/jobfairs/jobfairsuccess.php (1591 words)

	host karaoke cd+g shows on this hoster rack mount computer
		MTU´s Hoster software is the proven leader for ease of use and hosting professional Karaoke shows.
		MTU is the first company in the world to ship a digital audio workstation, starting in 1979, using digital audio since 1968.
		MTU is constantly reviewing and engineering what is the best system to meet your needs.
	www.mtu.com /basics/karaoke-hoster-rack.htm (412 words)

	How do I change my MTU setting - MajorGeeks Support Forums
		My MTU setting is 576 and I was told to change the setting to 1500 and it would help speed my mosem up alittle.
		I've understood the MTU setting for a while now, but just installed a router/firewall at home and there is an option to manually set the MTU on the router.
		Naw, I understand that 1500 is generally condsidered the optimum setting for DSL, but I had been using a hub and not a router and when I saw the setting on the admin screen to set the MTU size for the router I thougth "oh sheesh...
	forums.majorgeeks.com /showthread.php?t=16044 (890 words)

	MRV Communications, Inc. - MDU/MTU
		MRV provides a simple solution for MTU/MDU networks, whether they are in a single building or in a complex, and regardless of physical infrastructure.
		FSO technology creates a high-speed network interconnect (up to Gigabit Ethernet speeds), providing exactly the same service as physical fiber-optic cabling but without the cable.
		Remote Presence technology allows the administrator to securely access any part of the network either in-band (through the network itself) or out-of-band (through the telephony network) for management purposes.
	www.mrv.com /solutions/carrier/mdu_mtu.php (584 words)

	MTU (Maximum Transmission Unit) (Linktionary term) (Site not responding. Last check: 2007-11-06)
		An MTU is a parameter that specifies how much data a frame for a particular network can carry.
		This parameter becomes an issue when networks are interconnected and the networks have different MTU sizes.
		When a datagram arrives at a router that must be forwarded onto a network with a smaller MTU size, the router fragments the packet into pieces that will fit into the frames of the next-hop network.
	www.linktionary.com /m/mtu.html (157 words)

	What is maximum transmission unit? - a definition from Whatis.com - see also: MTU
		Too large an MTU size may mean retransmissions if the packet encounters a router that can't handle that large a packet.
		Too small an MTU size means relatively more header overhead and more acknowledgements that have to be sent and handled.
		In Windows 95, the default MTU was 1500 octets (eight-bit bytes), partly because this is the Ethernet standard MTU.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213605,00.html (401 words)

	MTU and MSS
		The default MTU specification was made in 1983 to help vendor implementations of devices like routers to insure interoperability.
		The main reason one would be concerned with changing a default MTU value is the problem of IP fragmentation.
		IP fragmentation occurs when you pass through a router with an MTU less than the MTU you are using.
	www.internetweekly.org /llarrow/mtumss.html (1042 words)

	HOW TO (Site not responding. Last check: 2007-11-06)
		When a network router receives a packet larger than the Maximum Transfer Unit (MTU) of the next network segment, and that packet's IP layer "don't fragment" bit is flagged, the router should send an ICMP destination unreachable message back to the sending host.
		If there are segments along the route with smaller MTUs, and the appropriate ICMP packet is not returned, the Ping utility should display "Request timed out." The default MTUs of common network media are described in Knowledge Base article 140375.
		This workaround assumes that you have determined the MTU and the state of all possible links that could be used by the host in question.
	www25.brinkster.com /chicagoTech/Tech/mtu.asp (6653 words)

	Mtu - The macosxhints Forums
		Now this tech guy told me that the problem is that my MTU settings on the router (1500 default) should be set to 1492.
		I haven't tried setting MTU on either the router or the Airport basestation (which is configured in "bridge" mode) but I haven't experienced a problem in sending email from the other computers (connected directly to the router).
		As I indicated it is sporadic and the 3 other Macs on the network experience the same effect at the same time which leads me to believe that the problem lies more on their side of the fence.
	forums.macosxhints.com /showthread.php?t=44106 (868 words)

	Large MTU Networks - IPv6 Jumbograms
		IPv6 (RFC 2460) is the next generation of IP networking protocol.
		Using RFC 1981 MTU path discovery is a perquisite for using IPv6 on any source node.
		Using Jumbograms certainly maximizes revenues of large MTU networks, as it defines a mechanism enabling the network layer to take advantage of these large MTU.
	www2.rad.com /networks/2003/largemtu/ipjgrams.htm (891 words)

	6 - Networking
		If you are a network administrator, and you are setting up routing protocols, if you are using your OpenBSD box as a router, if you need to go in depth into IP networking, you really need to read Understanding IP Addressing.
		This is obvious because an IP network is already configured on fxp0, hence the values "inet 10.0.0.38 netmask 0xffffff00 broadcast 10.0.0.255".
		For hosts that are on the same network as an Ethernet interface on the OpenBSD machine, which is in the 192.168.1.0/24 range, it will assign them an IP address between 192.168.1.32 and 192.168.1.127.
	www.openbsd.org /faq/faq6.html (8596 words)

	Weird networking MTU issue - Zugschlusbeobachtungen
		If the echo request is bigger than 1472 data bytes, the request needs to be fragmented as the Linux box’ MTU is 1500.
		The Windows boxes in question do not have an “MTU” option in the advanced settings of the network interface as other boxes have, and the appropriate Registry key setting the MTU is missing in the adapter settings.
		No, the windows boxes are plain clients that have never been on RAS, an the Network is not firewalled at all in the test setup.
	blog.zugschlus.de /archives/469-Weird-networking-MTU-issue.html (823 words)

	MTU in ICS using PPPoe
		The highest MTU value that works is the one you need to be using.
		The next step is to configure all your Client computers to use the new, lower MTU as the default for all Internet communication.
		View the contents of each key by clicking, and find the one that corresponds to your primary network adapter; it will be the one with more values than the other two, and will have an IP address value set to something like 192.168.0.x.
	www.duxcw.com /dcforum/DCForumID2/2037.html (581 words)

	( MTU ) - IP MASQ seems to be working fine but some sites don't work. This usually happens with WWW and some FTP sites.
		Though changing the MTU of the MASQ server's Internet link to 1500 seemingly fixes the problem, the possible bug is still there.
		Basically, you would be changing the MTU on all of the internal machines to match the MTU of your MASQ server's Internet connection.
		To change the MTU on a standard Ethernet link to your bridged or routed DSL, Cablemodem, etc. connection, you need to edit the correct network startup scripts for your Linux distribution.
	www.tldp.org /HOWTO/IP-Masquerade-HOWTO/mtu-issues.html (2190 words)

	TMT Chooses Jungo's CableHome-Based Software
		By integrating OpenRG into the HomeRAN and CableRAN coaxial networking systems, TMT was able to develop CableHome-based systems and benefit from a choice of broadband applications, an optimized Linux operating system, communication protocol stacks and remote management capabilities.
		In addition, by using Jungo software tailored for Intel's development platform, TMT was able to smoothly port their design onto an Intel(R) IXP425 network processor, and as a result reduce their Bill of Materials (BOM) and software costs prior to production.
		TMT is a technology and system vendor focusing on providing data and entertainment networking solutions that seamlessly integrate into the existing coaxial cable TV infrastructure.
	www.jungo.com /site_secure/pr030408.html (660 words)

	WinMag (Site not responding. Last check: 2007-11-06)
		Ending a dial-up connection doesn't always mean you're logged off the remote network.
		If you are using Windows 95 Dial-Up Networking to connect to an ISP, you've probably noticed th at the modem has already established a connection but Dial-Up Networking is still plodding along.
		From the Dial-Up Networking folder, right-click on the ISP connection and select Properties.
	www.winmag.com /library/1997/1102/95tip9.htm (515 words)

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