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Re: [NETVAERK] 20 sekunders forsinkelse til Apache2



Claus Alboege <sslug@sslug> writes:

>> Jeg sørger for at maskinernes ure er godt synkroniseret (inden for
>> 0.001 sekunder) og stracer wget-processen på klienten og alle
>> apache2-processerne på serveren.
>
> Hmm, kunne tcpdump på begge maskiner give yderligere info?

Jeg er glad for at du stiller lige netop det spørgsmål. Hvis jeg
tcpdumper på klienten og serveren ser de to gange tcpdump
GET-forspørgslen samtidigt:

Klient:

10:24:00.796239 IP 10.0.0.2.55873 > 10.0.1.20.www: P 1:107(106) ack 1 win 5840 <nop,nop,timestamp 3659924783 151547462>
sslug@sslug@.,^
...
....A.P?...".......%6.....
.&./    .nFGET /foobaz/ HTTP/1.0
User-Ag
10:24:00.796246 IP 10.0.1.20.www > 10.0.0.2.55873: . ack 107 win 1448 <nop,nop,timestamp 151547463 3659924783>
sslug@sslug@.2Q
...
....P.A"...?..3....-A.....
        .nG.&./

Server:

10:24:00.796095 10.0.0.2.55873 > 10.0.1.20.www: P 1:107(106) ack 1 win 5840 <nop,nop,timestamp 3659924783 151547462> (DF)
0x0000   4500 009e f8e6 4000 4006 2c5e 0a00 0002        sslug@sslug@.,^....
0x0010   0a00 0114 da41 0050 3fa0 fdc9 2299 9d1a        .....A.P?..."...
0x0020   8018 16d0 2536 0000 0101 080a da26 052f        ....%6.......&./
0x0030   0908 6e46 4745 5420 2f66 6f6f 6261 7a2f        ..nFGET./foobaz/
0x0040   2048 5454 502f 312e 300d 0a55 7365 722d        .HTTP/1.0..User-
0x0050   4167                                           Ag
10:24:00.796192 10.0.1.20.www > 10.0.0.2.55873: . ack 107 win 1448 <nop,nop,timestamp 151547463 3659924783> (DF)
0x0000   4500 0034 f35d 4000 4006 3251 0a00 0114        sslug@sslug@.2Q....
0x0010   0a00 0002 0050 da41 2299 9d1a 3fa0 fe33        .....P.A"...?..3
0x0020   8010 05a8 2d41 0000 0101 080a 0908 6e47        ....-A........nG
0x0030   da26 052f                                      .&./


-- 
 Peter Makholm     |                                              What if:
 sslug@sslug |                Tanenbaum had convinced Linus that his
 http://hacking.dk |                  operating system really was obsolete


 
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