Full Disclosure mailing list archives
Re: abnormal behavior Gmail logon
From: Valdis.Kletnieks () vt edu
Date: Wed, 31 May 2006 06:43:37 -0400
On Wed, 31 May 2006 09:23:08 BST, Edward Pearson said:
This isn't abnormal or weird, It happens when your internet connection is fairly slow and its because you sometimes receive incomplete headers for the page (broken or garbled)
If you have noisy hardware that's mangling data in transit, the mangling will *usually* be detected by the checksums on each IP packet. The reason your connection gets slow is because if a corruption is detected, the packet gets thrown out, and needs to be retransmitted by the sending system. If you're still on dialup, a noisy phone line will also make things go slower, as the modem will probably drop back to slower and slower speeds (which are more noise resistant. Getting 56K through a 56K modem requires near-perfect copper - but it will drop back to 44K, 33K, 19.2K. By the time you get down to 9600/4800/1200/300 baud, it can survive incredible amounts of clicks, hums, and other noises. Incidentally, the TCP checksums are *not* perfect. Usually, it doesn't matter, but you *should* verify the MD5 hash on a large file you've downloaded (like a .ISO image, etc). The average .iso is big enough that you have a fairly good chance of getting an undetected bad packet. So always check those md5sums.. :)
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Current thread:
- abnormal behavior Gmail logon Ratna Kumar Ch (May 30)
- RE: abnormal behavior Gmail logon Oscar Fajardo (May 30)
- Re: abnormal behavior Gmail logon Valdis . Kletnieks (May 30)
- <Possible follow-ups>
- Re: abnormal behavior Gmail logon Oscar Fajardo Sanchez (May 30)
- Re: abnormal behavior Gmail logon Valdis . Kletnieks (May 30)
- Re: abnormal behavior Gmail logon Oscar Fajardo Sanchez (May 30)
- Re: abnormal behavior Gmail logon Valdis . Kletnieks (May 30)
- Re: abnormal behavior Gmail logon Brian Eaton (May 30)
- Re: abnormal behavior Gmail logon Oscar Fajardo (May 30)
- RE: abnormal behavior Gmail logon Edward Pearson (May 31)
- Re: abnormal behavior Gmail logon Valdis . Kletnieks (May 31)
- Re: abnormal behavior Gmail logon Brian Eaton (May 31)
- Re: abnormal behavior Gmail logon Valdis . Kletnieks (May 31)
- RE: abnormal behavior Gmail logon David Farinic (May 31)
- Re: abnormal behavior Gmail logon Ajay Pal Singh Atwal (May 31)
- RE: abnormal behavior Gmail logon Oscar Fajardo (May 30)