Re: Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-15 Thread Tom Buskey
For gigabit, there's no such thing as a hub. You need a managed switch so you can create a mirror port. Netgear makes an 8 port one that's ~ $100. I think they have a 5 port version too. It can also do vlan, 802.3ad (bond/trunk 2 ports together for faster throughput) Splice the switch into

Re: Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-15 Thread M D L
There's no need to muck with iptables to make two ports into a switch. This is done using a bridge interface. Network Manager will even let you create a bridge (including running spanning tree) for any ports on the system. Might not have the lowest latency of a dedicated hardware switch, but

Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-14 Thread Joshua Judson Rosen
Trying to debug some comms problems between a couple of 1000baseT ethernet devices with poor visibility; can anyone recommend any inexpensive tap mechanisms that will let me run tcpdump or the like on the link from a Linux laptop? I'm actually not quite sure what my exact threshold for inexpensive

Re: Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-14 Thread Joshua Judson Rosen
Michael ODonnell mod.gnh...@b0rken.com writes: I don't know what your situation is but if there's a managed switch involved I believe that some of them can be rigged to echo traffic to one or more specified ports for analysis/debug. Mm. Good point. I don't think I have any managed switches

Re: Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-14 Thread Kevin D. Clark
Joshua Judson Rosen writes: Michael ODonnell writes: I don't know what your situation is but if there's a managed switch involved I believe that some of them can be rigged to echo traffic to one or more specified ports for analysis/debug. Mm. Good point. I don't think I have any

Re: Sniffing gigabit ethernet? 1000baseT LAN taps?

2014-04-14 Thread Richard Kolb II
whatever happened to just plain old snoop? On Mon, Apr 14, 2014 at 5:44 PM, Kevin D. Clark kevin_d_cl...@comcast.netwrote: Joshua Judson Rosen writes: Michael ODonnell writes: I don't know what your situation is but if there's a managed switch involved I believe that some of them