span

Unanswered Question
Jun 12th, 2008
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I think the answer is no , but is there anyway to setup a span session to a local pc with sniffer software on it and still be able to get to that pc via the network ? I believe span disables any outgoing traffic . I believe this will be a manual deal but just wanted to run this by everyone.

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michael.leblanc Thu, 06/12/2008 - 15:26
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I would concur with your opinion.


The answer probably lies in the fact that the sniffer is connected to a SPAN "Destination" interface.


Although I typically unbind the IP stack from the NIC used for Wireshark packet capture, I did the following a few minutes ago:


Note: My SPAN source interface is the trunk port used for inter-VLAN routing.


I configured the sniffer NIC with a static IP, then tried to ping a host on another network to verify that the sniffer NIC could place packets on the wire, and that my IP was what I expected.


I saw the sniffer NIC try to ARP its default gateway, but the gateway did not respond.



Then I tried to ping the sniffer NIC from a host on another network. I saw the local gateway ARP my sniffer NIC, but the NIC did not respond.


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