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1answer
31 views

make specified ip log filtering from port mirroring input with iptables [closed]

I have difficult to create an iptables rule of traffic coming from a switch that is configured as port mirroring. I checked if the traffic from my switch is sent with tcpdump -> Tcpdump detects ...
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1answer
39 views

Port mirroring not working through Vsphere

I have mirrored a port from Netgear switch to my VM on vsphere. I cannot see requests when using tcpdump to monitor the traffic, I only see replys. Netgear port mirror works as i have connected a ...
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0answers
62 views

ZyXel ES-2024 - Mirrored port showing duplicated traffic

I have a ZyXel ES-2024 PWD switch. I would like a computer plugged into port 26 to see all traffic that passes through port 2, both inbound and outbound. I have configured port mirroring for the ...
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1answer
653 views

How to enable Cisco switch port mirroring without rebooting?

I have a Cisco WS-C2960S-24TS-S switch and would like enable a port mirror for network analyzer (such as Snort). I could not see any options in the GUI interface. Is it possible, and how do I enable ...
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votes
3answers
110 views

Optical mirroring

I have a 10G XPF+ optical cable with market updates from a stock exchange. This cable goes into a switch, which then mirrors every packet to a couple of computers over two ports. The problem with ...
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1answer
80 views

Port mirroring, 1 source, two destination disadvantages [closed]

What are the disadvantages of having two port mirroring sessions? I have a Cisco 2960 switch in which there is one session having Gi0/1 as source and Fa0/48 as destination. Is it possible to ...
2
votes
1answer
2k views

Network Tap (SPAN port) on FortiGate 100D (FortiOS 4.0MR3)

I'm dealing with a FortiGate 100D for the first time, and am scratching my head as there doesn't seem to be an easy way to mirror ports in the switch; which is really a facility that I presumed it ...
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3answers
567 views

Monitor traffic between two network switches using a transparent firewall

For debugging reasons i need to see what network traffic especially TCP is transmitted or not. I thought about using an Endian firewall for this, but it doesn't support 2 network interfaces with the ...
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2answers
374 views

Networking: Would my SPAN setup on Cisco router create a switching loop?

I'd like to set up a SPAN [port-mirror] port on our main router. The router is a Cisco 2821. The goal is to be able to troubleshoot Internet issues at the packet level, and it won't happen that ...
2
votes
1answer
119 views

SPAN/Mirrored port usage

I have a HP ProCurve switch with 24 ports. If I set up port 24 to mirror port 1 (which goes to my router), can I use port 24 for normal LAN access as well as to run something like ntop or bandwidthd? ...
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0answers
310 views

SFP port mirror on 5548 - not working

For the sake of monitoring my internet connection I have set up a port mirror on my Dell powerconnect 5548 from the SFP port to a 1Gb port on the switch, connected to my monitoring interface. The SFP ...
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vote
1answer
2k views

Is it possible to mirror port to capture packets between VM host and VM?

I have 2 physical machines, A and B. A runs VMWare Workstation with a virtual machine C. C is using Bridged network interface. A and B are both connected via ethernet to a switch. B has two NIC's. ...
2
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1answer
8k views

HP Procurve 5406ZL - How to enable port-mirroring?

This is my first time asking a question here but I've been lurking around Serverfault and Superuser for a bit. I've tried searching for this but I have yet to find something that would be able to help ...
3
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1answer
163 views

Port Mirror and 802.1Q

Does a port mirror send ethernet frames out of the switch-port with the 802.1Q header bytes still on the frame?
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2answers
128 views

XP box with 3 NICs on Server 2003 Domain

I have assigned all three NICs IP addresses that are outside the DHCP pool. I have 2 NICs are connected to 1 switch and the 3rd to my second switch. I want to assign one of the two NICs on the 1st ...
2
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1answer
1k views

vSphere Promiscuous mode only receiving packets one way from network switch

We have two network switches, a POE switch (SwitchA) to power our phones / users computers and a non-POE switch (SwitchB for the rest network.) Each switch is setup to do port mirroring to support ...