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Old 08-18-2004, 06:46 PM   #1
gauge73
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Registered: Jan 2003
Location: Dallas, TX
Distribution: Fedora Core 4
Posts: 420

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Strange PPP activity


I am on dialup now ( ), and I have been noticing that my file transfers are particularly slow in comparison with everything else. So, I ran tcpdump to see what was going on. In actuality, the transfers are running really fast, but they pause every few seconds during which my modem does not send an ACK. I just receive the same packet 20-30 times in a row, and then the ACKS finally start up again for another few seconds after which it repeats. Can anyone tell me what might be causing this? Here is a snippet from tcpdump:

Code:
18:44:08.814909 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 43801 win 64240 (DF)
18:44:08.856613 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 43801:45261(1460) ack 571 win 33580 (DF)
18:44:09.016084 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 45261 win 64240 (DF)
18:44:09.116612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 45261:46721(1460) ack 571 win 33580 (DF)
18:44:09.317864 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 46721 win 64240 (DF)
18:44:09.356615 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 46721:48181(1460) ack 571 win 33580 (DF)
18:44:09.519024 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 48181 win 64240 (DF)
18:44:09.596616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 48181:49641(1460) ack 571 win 33580 (DF)
18:44:09.720201 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 49641 win 64240 (DF)
18:44:09.836615 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 49641:51101(1460) ack 571 win 33580 (DF)
18:44:10.021964 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 51101 win 64240 (DF)
18:44:10.076612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 51101:52561(1460) ack 571 win 33580 (DF)
18:44:10.223142 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 52561 win 64240 (DF)
18:44:10.336613 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 52561:54021(1460) ack 571 win 33580 (DF)
18:44:10.524905 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 54021 win 64240 (DF)
18:44:10.556615 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 54021:55481(1460) ack 571 win 33580 (DF)
18:44:10.726073 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 55481 win 64240 (DF)
18:44:10.816616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 55481:56941(1460) ack 571 win 33580 (DF)
18:44:10.927259 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 56941 win 64240 (DF)
18:44:11.036612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 56941:58401(1460) ack 571 win 33580 (DF)
18:44:11.229017 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 58401 win 64240 (DF)
18:44:11.296612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 58401:59861(1460) ack 571 win 33580 (DF)
18:44:11.430205 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 59861 win 64240 (DF)
18:44:11.516615 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 59861:61321(1460) ack 571 win 33580 (DF)
18:44:11.776616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 61321:62781(1460) ack 571 win 33580 (DF)
18:44:12.036618 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 62781:64241(1460) ack 571 win 33580 (DF)
18:44:12.256612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 64241:65701(1460) ack 571 win 33580 (DF)
18:44:12.496612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 65701:67161(1460) ack 571 win 33580 (DF)
18:44:12.736612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 67161:68621(1460) ack 571 win 33580 (DF)
18:44:12.976616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 68621:70081(1460) ack 571 win 33580 (DF)
18:44:13.236618 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 70081:71541(1460) ack 571 win 33580 (DF)
18:44:13.456616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 71541:73001(1460) ack 571 win 33580 (DF)
18:44:13.716611 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 73001:74461(1460) ack 571 win 33580 (DF)
18:44:13.936612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 74461:75921(1460) ack 571 win 33580 (DF)
18:44:14.196616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 75921:77381(1460) ack 571 win 33580 (DF)
18:44:14.416614 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 77381:78841(1460) ack 571 win 33580 (DF)
18:44:14.676616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 78841:80301(1460) ack 571 win 33580 (DF)
18:44:14.916612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 80301:81761(1460) ack 571 win 33580 (DF)
18:44:15.156612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 81761:83221(1460) ack 571 win 33580 (DF)
18:44:15.396616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 83221:84681(1460) ack 571 win 33580 (DF)
18:44:15.636612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 84681:86141(1460) ack 571 win 33580 (DF)
18:44:15.876616 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 86141:87601(1460) ack 571 win 33580 (DF)
18:44:16.136611 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 87601:89061(1460) ack 571 win 33580 (DF)
18:44:16.356612 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 89061:90521(1460) ack 571 win 33580 (DF)
18:44:18.036610 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 59861:61321(1460) ack 571 win 33580 (DF)
18:44:18.169595 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 61321 win 64240 (DF)
18:44:18.636615 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: P 122641:124101(1460) ack 571 win 33580 (DF)
18:44:18.637053 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 61321 win 64240 (DF)
18:44:18.876614 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 124101:125561(1460) ack 571 win 33580 (DF)
18:44:18.877086 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 61321 win 64240 (DF)
18:44:28.576605 4.225.23.136.4295 > my.ip.add.res.5554: S 1857636867:1857636867(0) win 8760 <mss 1460,nop,nop,sackOK> (DF)
18:44:30.716610 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 61321:62781(1460) ack 571 win 33580 (DF)
18:44:30.843626 my.ip.add.res.krb524 > xxx.xxx.xxx.xxx.http: . ack 62781 win 64240 (DF)
18:44:31.316617 xxx.xxx.xxx.xxx.http > my.ip.add.res.krb524: . 62781:64241(1460) ack 571 win 33580 (DF)
 
  


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