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Cisco 2950c

I have a problem when trying to track down certain machines on the network. If a computer is on permanently it is not difficult to track it down. Some students only turn there pc on long enough to check mail, or browse the internet for a few minutes. By the time I find out they were causing...

Cisco 3550

I am trying to set up a Span session to monitor traffic leaving a port on another port. I can do this fine. The problem is I cannot remember the command to also make the destination port a working network access connection. As soon as I setup the Span my network connectivity on the...

Correct, I set up bdpu guard to err disable the port for 6 minutes in the future. Seems to be working good.

Thanks, I just needed to type vlan 110 This was for a cisco 2950 c I am having the same problem now on the catalyste 5505 but it is a little different. How do I set the virtual vlan interface on the 5505? I see this command in the config. I need the vlan 110 interface to have this ip...

Here is the setup interface Vlan110 ip address 10.10.2.60 255.255.255.0 no ip route-cache ! ip default-gateway 10.10.2.7 ip http server #show interface vlan 110 Vlan110 is up, line protocol is up Hardware is CPU Interface, address is 0011.218e.5700 (bia 0011.218e.5700) Internet address...

I have a few switches which cannot communicate over vlan 110(management vlan) the configuration is exactly the same as other switches which work fine. interface vlan 110 is not shutdown If I run show spanning-tree detail all other vlans are forwarding but 110 is not. The interface is up...

Port 1 would be source, port 6 would be destination

Found the problem: A student had a laptop with both a wireless and ethernet card and network bridging setup between them. The problem was happening when both cards were connected to the network. I have seen articles that many schools have seen the same problem and that enabling port fast and...

have just changed it to: monitor session 1 source interface fa0/10 tx same result

I am trying to monitor interface fastethernet 0/10 on a cisco 295c switch. I've run the following commands: monitor session 1 source interface fa0/10 monitor session 1 destination interface fa0/7 I am trying to make all traffic going to and from fa0/10 to be sent to fa0/7 to monitor with...

We are currently not running snort, possibly in the future but we don't have the resources to manage it right now. We use NetReg DHCP but the client causing the problem did not register. The only thing I was using on the switch was the mac-address-table which doesn't last very long so a few...

We have been experiencing problems on our student network where 2 mac addresses (one wireless, one cat5) are telling the rest of the computers on the network that they have the IP address used by the other computers. Every computer on the network gets the following errors: The wireless Mac...

Assuming this is his real mac address blocking the mac at the router should stop him until he changes his mac. If I understand cisco port security it dynamically registers a mac to the port, if the mac address changes it blocks the port. Is this correct, if so how does this interfere on a...

It seems to have accepted all the inputs, but the mac is not being blocked yet. I'm wondering if it's allowing it through because the first couple groups of acl's allow the traffic before it even gets to acl 700. Any suggestions: charybdis#show running-config Building configuration...

I have a Cisco 3550 Fiber switch which feeds all remote buildings (Cisco 2950c's). This switch has two management vlans assigned 500 (10.10.1.0)with address of 10.10.1.9, and 110 (10.10.2.0)with address of 10.10.2.7. From the ops network vlan 400 (172.16.1.0) I need to be able to manage this...

Could you show me how I could do this at the router level using an acl? Thanks

Cisco 2950c

We have someone causing denial of service attacks on our student network, maybe once a week for about 20 minutes. He is somehow causing ip address conflicts on the network from one mac address. I have the mac address but am unable to find it in any of the switch arp's. Is is possible to block...