Hosts on same switch cannot see each other

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Sep 20th, 2010
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On our Cisco 2960-POE switch - connected hosts can see the switch VLAN IP, can get to and from both the corporate network (VPN) and Internet (split-tunnel) -  but cannot see each other.  We can ping one attached PC and an attached printer from the switch - but the PC can ping the printer.

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Jon Marshall Mon, 09/20/2010 - 12:14
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What is the default-gateway on the connected hosts ?


iholdings Mon, 09/20/2010 - 12:46
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Thanks for the prompt reply

The deafult-gateway on both devices is the IP address of the local firewall (

If we cross-connect the "old" switch (not sure of make/model) to the 2960 - and plug the printer into that switch - the hosts on the 2960 can see the printer.

This is the first time I've ever encountered this loss of intra-switch connectivity.


iholdings Tue, 09/21/2010 - 05:00
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I guess that's possible - but I haven't seen any ports restricted or shutdown based on any policy violations.  They simply will not talk to each other across the switchports.

Am I better off setting the switch back to factory and reconfigure?  We are in a VoIP environment on that network - so I've been assigning roles IP Phone + Desktop for those ports where that's applicable.  Could that be the problem?


milan.kulik Tue, 09/21/2010 - 05:10
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as the first step, I'd simply identify the ports to which that PC and printer are connected.

Let's say those are ports  FastEthernet0/8 and FastEthernet0/9.

Then I'd simply:

conf t

interface FastEthernet0/8
no switchport protected
interface FastEthernet0/9
no switchport protected

and test if you can Ping between those two devices connected.



chabasimon Tue, 09/21/2010 - 05:12
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A) You can configure data Vlan for Desktops cause i can only see the voice vlan.

B) You default gateway of your Hosts, shoud be your Vlan IP address, which for vlan1 is



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