[CS-FSLUG] Wget getting sloooowwww

[Tim Young]

If ping takes 10 seconds tp start pinging, you probably have a DNS issue.  Try
pinging something first my name, then by IP
ping www.google.com
ping 66.102.7.99

If the pinging by number responds faster, then the issue is probably a DNS one.

To determine if it is a speed thing, what time does a ping take to the two
locations take?  The ping command actually tracks the time it takes to get from
point A to B and back to A.  That might be 34ms, or something like that.  If
the time it takes the ping to traverse the Internet is drastically different,
then it might be something like the MTU issue.

The MTU (Maximum Transfer Unit) is the size of packet that gets sent (it should
not affect a ping, as pings are usually small unless you are trying a ping of
death.)  If the router has a smaller MTU than the computer sends out, the
packet gets fragmented, and needs to be rebuilt on the other end which slows
the process down.  File transfers would try to use fairly large packet sizes,
though the large packets would originate from the sending computer.  So if you
are downloading something, then the MTU problem would be on the server you are
downloading from.  You can set your MTU with the ifconfig command:
    ifconfig eth0 mtu 1200

    - Tim Young

"Robert W." wrote:

> On Tue, 2005-03-22 at 18:46 -0500, Don Parris wrote:
> > A friend of mine is running a dual-boot WinXP & SUSE 9.2 system.
> > He is able to get to User Friendly (for example) in about 2 seconds
> > using Firefox under X.  Same for WinXP.  Wget takes 30+ seconds, and
> > frequently times out.  Ping takes at least 10 secs to start pinging,
> > but dig takes a second or so.  WinXP's ping is blazing, as well.
> >
> > Any ideas on what gives with the slowness of wget/ping under SUSE?
>
> I seem to recall similar problems being caused by the MRU size. Is MRU
> the right acronym? Sorry, I'm not very knowledgable with networking.
> I'm going from memory of things that came from the SuSE mailing list.
>
> As I recall, the issue was that Windows and Linux had different MRU
> sizes. Windows matched a router, but Linux did not. So Linux networking
> appeared to be very slow. Maybe this'll jog somebody's memory on how to
> fix the problem.
>
> --
> Robert W.
> robertwo at access-4-free.com
>
> And the LORD said... "I will have mercy on whom I have mercy, and I
> will have compassion on whom I will have compassion." -- Exodus 33:19b
>
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