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Tuning up MTU (Maximum
Transmission Unit) to speed up Internet access
Now let me tell you
one important fact related with tuning. Value of MTU depends upon how fast a
connection you have, what kind of activities you perform (ask yourself a
question. Are your a mild, average or high end user of Internet ? To put it in
other words, Do you download little or nothing, or are an average surfer or are
Internet savvy individual and download everything from programs,apps,patches to
watching Internet audio/video real-time content?) Depending upon who you are as
a user and what kind of connection (modem,dsl,cable or in rare cases T1/T3),
this tuning may have little to significant effect on your Internet experience.
All right MTU stand for Maximum Transmission Unit.
Value of MTU decides
the size of Internet data packet. Bigger the size, more you can transfer.
Analogy could be made with a bucket. If bucket is small, you can carry
little but it would be no strain on your strength. Bigger the bucket, more you
can carry but it strains your physical strength. (Well! Its not that simple but
good enough to understand). Objective should be find a perfect balance which
works for you. I think maximum that you can put is as value of MTU is 1500 (but
could be higher for your specific network) and it may not make sense making it
smaller than 68.
Again this is a registry tweak unless and until you
have a tweaking utility that can do it for you.
Open Registry by going to
START-RUN and entering REGEDIT and Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
es\Tcpip\Parameters\Interfaces\ ID for Adapter. For this right click on right
pane and add a key by the name MTU. For this key you can add a DWORD value from
68 to 1500 (or higher value is certain cases).
If you put less than 68,
it will default to 68. If you put a value higher than 1500 or your Network
permitted max, it will default to permitted
max.
Enable automatic path MTU size detection and
impro
As stated on previous tip (Tip 52), MTP size plays an important role in
deciding Internet speed. But its not so easy to determine the right value of
MTU. For those of us who fall in this category and would prefer computer to find
that for us, follow trick may work. I can not say with confidence whether this
would work across all network but it should and there is no harm in trying it
out. Now before I do that let me tell you what this action will
do.
Applying this trick, you would ask computer to automatically find out
the maximum MTU size possible in the connection path to a host. This value could
be different for different sites. I think this trick should pick the lowest
common denominator across a particular path. Typically If MTU size is not
optimized, this job has to be done by a router which would mean a significant
waste of time (small chunks adds to a considerable loss if you imagine that
there are billions of packets involved across the whole Internet) resulting in
poor throughout and congestion on cyber lanes. All right this key is called
EnablePMTUDiscovery.
Again this is a registry.Open Registry by going
to START-RUN and entering REGEDIT and Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
es\Tcpip\Parameters\Interfaces\ ID for Adapter. For this right click on right
pane and add a key by the name EnablePMTUDiscovery. For this key you can add a
DWORD boolean value of 0 or 1 with 1 being TRUE (value that enables auto
detection).
Since we are trying this tweak, set to 1 and enable the TCP
to attempt to discover the MTU size over the specific path to host. Microsoft
has an interesting article on many similar tips <&gt; and is titled TCP/IP
and NBT Configuration Parameters for Windows (Q120642). <&gt;
Tuning up MTU (Maximum
Transmission Unit) to speed up Internet access
Now let me tell you
one important fact related with tuning. Value of MTU depends upon how fast a
connection you have, what kind of activities you perform (ask yourself a
question. Are your a mild, average or high end user of Internet ? To put it in
other words, Do you download little or nothing, or are an average surfer or are
Internet savvy individual and download everything from programs,apps,patches to
watching Internet audio/video real-time content?) Depending upon who you are as
a user and what kind of connection (modem,dsl,cable or in rare cases T1/T3),
this tuning may have little to significant effect on your Internet experience.
All right MTU stand for Maximum Transmission Unit.
Value of MTU decides
the size of Internet data packet. Bigger the size, more you can transfer.
Analogy could be made with a bucket. If bucket is small, you can carry
little but it would be no strain on your strength. Bigger the bucket, more you
can carry but it strains your physical strength. (Well! Its not that simple but
good enough to understand). Objective should be find a perfect balance which
works for you. I think maximum that you can put is as value of MTU is 1500 (but
could be higher for your specific network) and it may not make sense making it
smaller than 68.
Again this is a registry tweak unless and until you
have a tweaking utility that can do it for you.
Open Registry by going to
START-RUN and entering REGEDIT and Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
es\Tcpip\Parameters\Interfaces\ ID for Adapter. For this right click on right
pane and add a key by the name MTU. For this key you can add a DWORD value from
68 to 1500 (or higher value is certain cases).
If you put less than 68,
it will default to 68. If you put a value higher than 1500 or your Network
permitted max, it will default to permitted
max.
Enable automatic path MTU size detection and
impro
As stated on previous tip (Tip 52), MTP size plays an important role in
deciding Internet speed. But its not so easy to determine the right value of
MTU. For those of us who fall in this category and would prefer computer to find
that for us, follow trick may work. I can not say with confidence whether this
would work across all network but it should and there is no harm in trying it
out. Now before I do that let me tell you what this action will
do.
Applying this trick, you would ask computer to automatically find out
the maximum MTU size possible in the connection path to a host. This value could
be different for different sites. I think this trick should pick the lowest
common denominator across a particular path. Typically If MTU size is not
optimized, this job has to be done by a router which would mean a significant
waste of time (small chunks adds to a considerable loss if you imagine that
there are billions of packets involved across the whole Internet) resulting in
poor throughout and congestion on cyber lanes. All right this key is called
EnablePMTUDiscovery.
Again this is a registry.Open Registry by going
to START-RUN and entering REGEDIT and Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
es\Tcpip\Parameters\Interfaces\ ID for Adapter. For this right click on right
pane and add a key by the name EnablePMTUDiscovery. For this key you can add a
DWORD boolean value of 0 or 1 with 1 being TRUE (value that enables auto
detection).
Since we are trying this tweak, set to 1 and enable the TCP
to attempt to discover the MTU size over the specific path to host. Microsoft
has an interesting article on many similar tips <&gt; and is titled TCP/IP
and NBT Configuration Parameters for Windows (Q120642). <&gt;
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