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ross_MoHaX
n00b
Joined: 13 Feb 2005
Posts: 42
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 Posted: Wed Oct 18, 2006 10:57 am Post subject: Low-level network monitoring |
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| Is there any tools for real-time low level monitoring of my ethernet cards? How to check does send buffer is full, how long packets are waiting to be sent, how many retransitions were made etc? |
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fatcat.00
Tux's lil' helper
Joined: 12 Aug 2002
Posts: 145
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| Posted: Wed Oct 18, 2006 7:56 pm Post subject: |
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tcpdump or ethereal will both let you monitor packets to the bit level. Neither will tell you about buffers, that will have to fetched out of the kernel driver somehow, no idea how to do that. Whether something is a retransmit or not you will have to determine if you use tcpdump, but I think ethereal has some tools to help with that.
If you are looking for primarily statistical information of network flows, try ntop.
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nielchiano
Veteran
Joined: 11 Nov 2003
Posts: 1287
Location: 50N 3E
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| Posted: Sun Oct 22, 2006 11:33 am Post subject: |
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| fatcat.00 wrote: | | Whether something is a retransmit or not you will have to determine if you use tcpdump, but I think ethereal has some tools to help with that. |
Depends:
if it's a TCP-level retransmit, tcpdump/ethereal/wireshark will show that
if it's a ethernel-level retransmit (after a collision), they wont's nee it.
if you want those low-level stats, ifconfig gives some of them (errors, collisions, ...) |
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Networking & Security
