Cisco Switching/Routing :: SG300-10 See All Traffic From All Connected Devices On Any Port / Where To Connect Listening Device

Dec 20, 2012

In my LAN environment, I'm using two cisco SG300-10 switches. Both switches are connected by GE10 on both switches, where both ports are set to trunk.Now on all ports 1-9 on both switches, I'm having client computers attached. So I set ports 1-9 to "access" mode.All interfaces on any switch is left in default vlan.
Is it normal that I see all traffic from all connected devices on any port where I connect a listening device?What I'd like to achieve is, that only traffic that is meant for a specific workstation is actually forwarded to this workstation. By now it seems that I get all the traffic from everybody.

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Cisco Switching/Routing :: UDP Port 10000 And IPv6 Ports Listening

Aug 30, 2012

I've several production Catalyst switches that are listening on the same IPv4 and IPv6 ports. The problem is I don't want the switches listening on the IPv6 ports.[code] How to shut down these listening ports?I also have a few production switches listening on UDP/10000 and I cannot determine why this port is listening. [code] I've seen where UDP/10000 is Network Data Management Protocol and is related to Storage networks ###, but I've also seen where UDP/10000 is the default port for IPSEC data.I don't believe UDP/10000 is related to either NDMP or IPSEC data, though I could be very wrong.

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Cisco Switching/Routing :: 3560 Command Shows Two Devices Connected Through Same Local Port?

Oct 14, 2012

show cdp neighbors command shows two devices connected through the same local port?I have a Cisco 3560 that when I issue the "show cdp neighbors" command I get the following results: [code]
the question is why is this showing that Gig0/3 is being used twice to  connect to two different devices.  I have verified there is no hub  connected to this port and in fact Switch3 is not connected to Switch1  at all yet it still shows up in the CDP table.
I have cleared the CDP table on every device at this location and still get the same results. 

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Cisco Switching/Routing :: SG300-28P And SF200-24P Connected Via LAG Group / Configurations Won't Save

Dec 10, 2012

I have a SG300-28P and a SF200-24P connected via LAG Group.  SG300 routes.  I also have 2 VC240 IP Cameras.  They are connected on ports 18 and 19 on the SF300.  If I lose power, reboot or anything that makes the switches restart, the configuration is not saved.  I know this by the fact that after a reboot, ports 18 and 19 are placed in VLAN 4 Untagged.  If I put them back in VLAN 2 Untagged, save the configuration and reboot, they are placed back in VLAN 4 Untagged.
I read something on here about firmware the other night from my iPad so today, I upgraded both switches to the latest firmware,  After the update, I could not access the IP Cams.  I went back into the configuration and they were in VLAN 4 Untagged.  I once again put them in VLAN 2 Untagged, saved the configuration and rebooted.  They went back to VLAN 4UP.
There was previous discussion also about xml version of files or something and that a factory reset and setting the switch up from scratch would take care of it.  I cannot do this, I am a seed corn salesman.  Is there a simpler way?  Like saving the config to TFTP and then uploading it after factory reset?  There is LLDP settings for my IP Phones too that if I lost them, I would have no idea how to regenerate them to make my switch work again.  Cisco tech support had issues with it when I first got them and they set it up via remote session so I am lost beyond this.  I just know that I cannot keep going into the switches to change settings and not have them saved.  I lose my security cameras and video recording.

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Cisco Switching/Routing :: L2 SG300 Want To Configure One Port As A Turn

Apr 3, 2013

I have  a cisco  L2 SG300-10p  Managed  switch .  I want  to  configure  one  port as a turn  but cant find  the command  Encapsulation dot1q . Its a  poe  switch  i want  to use  for  both  internet and voip  in separate  vlans.

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Cisco Switching/Routing :: SG300 Restrict Port To Only One Access Point

Jun 10, 2012

On a small Bording School we have the students living in several small houses, each equipped with an AP.Each Ap serve 4 Vlans.I want to restrict the switch for these AP, in a way to keep the students from removing the AP and connecting their own equipment.I tried using the secure port feature on the SG300, but that had the result of allowing the AP but denying all the users connected to the AP.The switch is a SG300-28P placed in L3 mode.

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D-Link DIR-655 :: Devices Connected Not Showing In Device Info List

Apr 26, 2011

I just got a DIR-655 and set it all up pretty easily. I have 6 wired and 3 wireless. All work fine and all are set to use DHCP. But if I go (in the router) to the Lan Computers list under Device Info, three devices (2 wired, 1 wireless) do not appear. I do have a switch added to the system, but of the three devices connected to it, 1 shows in th Lan Computers list and the other 2 do not.Since everything works, I'm mostly just curious why this is. Every previous router I've had showed everything correctly.

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Cisco Switching/Routing :: 3825 ISR - Traffic Route From Switch Port To Router Port

Jun 5, 2013

I'm fairly new to Cisco products am in the process of developing my network knowledge on a deeper level.  I have a 3825 with a HWIC-4ESW and I'm struggling to fully understand how the two "see" each other.  I've setup a V LAN with a layer 3 address on the HWIC and added the switch ports to it.  This seemed to allow devices connected to the switch ports to talk to the built-in router ports.  I thought this was all making sense until i applied an access-list to the router port.  It's a simple ACL i'm just using for testing and the only thing it does is blocks telnet from anywhere.  I know the ACL is setup properly because if I connect a device directly to the router port i cannot telnet to the port.  However, if i connect a device to one of the switch ports, i am able to telnet to the router port successfully. 

It seems that I'm missing something with how traffic flows from the switch port to the router ports and how the two "see" each other. 

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Cisco Switching/Routing :: Switches Listening On 1975 And 2228 / UDP?

Mar 11, 2007

How come many switches show that they are listening on port 2228/udp and 1975/udp? You can see this by running 'show ip sockets'.

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Cisco Switching/Routing :: 2950 - Devices Can't Connected To Server At Core Sw

Jan 11, 2013

In my organization we have several 2950T that conected each other. We have 4 floor with each floor have 1 sw except 4th flr have 3 sw.
Main server, apps, db ( 15 units) connected to core sw at 4th flr. Currently the problem is others devices can't connected to the server at core sw. Test ping and the network to core sw is intermittent problem. When ping 100 times only 30 reply. After 10 minutes the connection restored. Ping 100 times successful. It will not having problem again until the next day. This already happen 3 days. Any command for me to use to check if port or the switch having problem? Any log i can collect

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Cisco Switching/Routing :: 887 - How To Restrict Devices Connected To 800 Series Router

Jan 30, 2013

I have a Cisco 887M router which I wish to restrict the devices allowed to be connected/allocated an IP address to two, and *only* two.
I can't, for the life of me, find out how to allow these two devices to connect to ANY port - I can configure a MAC restriction on a single port, but I don't know how to make it so that I can allow JUST these two devices to connect to any port in the 4 port switch/VLAN (VLAN 1 is used because the mongrel who set this up was lazy). I know the MAC addresses I want to allow
How I can do this? I *can* restrict any given port to the two MAC addresses - but if I try to add the MAC addresses to another port, they get removed from the initial one. I need to be able to have them connect to ANY port and work, but allow NOTHING else to work.
For those wondering, this is to counter a user who is utilising company resources for purposes not approved - and costing us quite a bit of money in the process.

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Cisco Switching/Routing :: 1921 Router To Ping The Local Devices Connected To Network

Feb 7, 2013

I wounder if there is any way to ping the local deviceses connected to a network hosted by a Cisco 1921 router? I wan't to be able to ping the device(computer name) but currently cant do that.

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D-Link DIR-655 :: Is PORT 111 Really Listening

Aug 16, 2011

I recently had a security scan done on a DIR 655 and the report came back saying PORT 111 (Unix RPC Service) should not be listening for external connections. I've looked through every setting but can't find where this service is enabled (or can be altered) -- aany guidance on this port/service?

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D-Link DIR-615 :: HTTP Listening On Port 65535

Aug 4, 2011

I am just setting up a LAN using DIR-655 and I noticed this line in the logs: notice   Aug 4 03:25:55   HTTP listening on port 65535

Is the router listening to that port?

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Cisco :: Spanning-tree Every Port Go Into Listening / Learning State

Apr 4, 2012

Ages ago I was shadowing someone making a change on the network. I cannot remember which spanning tree version was running and cannot remember the config of any port either. What I do remember is that every switch port on the 2960 switch went orange and an outage occured, where the ports went into listening / learning mode. I assume that the STP was just the default ieee 802.1D.

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Cisco Routers :: RV220W Default Listening Port For Management

Aug 13, 2011

recently got a RV220W and liking all the configuration options.
Although I cannot find where to change the listening port for management? I want it to listen on port 81 instead of 80.

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Cisco Switching/Routing :: VTP Traffic Not Seen On SPAN Port On 3750

Dec 12, 2011

Been dealing with a strange problem for several days now.  It started out with a problem that I thought was VTP related but ended up being something else.  I setup a span port on a 3750 that I am connected to that was mirroring the trunk connection coming into the switch.
Never saw an VTP traffic come across the connection but doing a sh vtp status indicated the traffic was arriving and getting processed.  When I found some debug commands (debug sw-lan vtp), I was also able to see the packets go between switches.  Seeing this issue concerns me that there is other traffic that isnt showing up during a span session.
I know that doing a span on a switch, especially using a trunk port as a source, isnt a good idea.  Since I didnt have a TAP at time, this was my only choice.  I have since borrowed a NetOptics TP-CU3 tap from a good friend and was able to confirm the VTP traffic was going across the trunk connection between switches.
All of my 3750's are running 12.2.55.SE.

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Cisco Switching/Routing :: 3550 - Redirecting Port 80 Traffic?

Dec 12, 2011

How do I redirect my port 80 traffic to my Trend Micro IWSVA in my 3550 switch? How do I use PBR? Can I use WCCP in my 3550?

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Cisco Switching/Routing :: ASA 5505 Dropping Port 443 Traffic?

May 10, 2012

Networking is not my gig, but it has to be at this very moment.  We have an ASA 5505. Let me explain what's going on.
On Tuesday I wanted to be able to use the ASDM since there is less room for error.  But we only had a console set up.  So I ran the following commands...
in ($config)   
http      of course didn't do anything incomplete command
http        didn't anything incomplete command
http inside 


Everything started working after that.  Everything worked fine all of wednesday and thursday.  Then this morning it stopped processing again.  When I traceroute it gets to the machine that is hooked up to the console and stops.  So I'm guessing its actually getting to the ASA router and being swallowed up again...

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Cisco Switching / Routing :: C3560 - 48PS Port / Get Any Device To Talk To DHCP Server?

Sep 11, 2011

I have a c3560 that on Port 1 I can not get any device to talk to the DHCP server.Previously there was a client connected to this port however over the weekend he stated he lost connectivity.

In my troubleshooting I have connected that client to another port and now he is good to go...I connected my laptop and tried to connect to the network however I could not.I checked the logs and did not see anything that lead me to think it was having problems.

Is there another way to shut this down and hopefully start it back up without having to restart the entire switch?

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Cisco Switching/Routing :: 2960 Which Port On Switch Its Connected

Mar 2, 2012

If I knew the IP address of a host, can we know on which port on the switch its connected. The switch model is 2960

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Cisco Switching/Routing :: Why Last Port Of Two Catalyst 3560X Are Connected Together

May 22, 2012

We have two catalyst 3560X 24T-S switches connected on two separate LANs (both the networks are redundant to each other). The last port of the switches are connected together?

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Cisco Switching/Routing :: 4510 - Command To See If Port Was Ever Up And Passed Traffic

Apr 24, 2012

I am looking to find a command or counter to tell me if a cisco switch port on a 4510 was ever up and passed traffic.  I want to shutdown all unused switchports on our access switches.  But before I do that I need to make sure device is just not off or the person is away on vacation.  If I do sh int interface, is there a counter I can reference.

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Cisco Switching/Routing :: 3750 - How To Isolate Fiber Port Traffic

Jun 18, 2012

We would like to setup a link to our DR site that is separate from our main network traffic.  This link will be used by an EMC VNX SAN for replication traffic.  The SAN will be plugged into a fiber port on a 3750 switch and going out from the same switch (going in as multimode, going out as single mode) into a patch panel that runs over to the DR site (about a mile away).  At the DR site it will go from the fiber panel into another 3750 switch which ends up going back out of that switch into our DR SAN.
I'm wondering what the best way would be to configure the fiber ports to accomplish this.  I'm affraid that the replication traffic will find it's way over through another route and congest our main network unless configured appropriately.

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Cisco Switching/Routing :: SRP547w - Allow Traffic On Port 25 From External IP Filter?

Nov 16, 2011

Can the SRP547W be configured to allow traffic on port 25 from an external ip range to an internal address?

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Cisco Switching/Routing :: 2811 Port Is Connected To Fiber Or Copper

Jan 14, 2013

I need Know what connection is using on Cisco 2811 router.I have this interface in Cisco 2811, I need Know if this port is connected to Fiber or Copper. I think is copper with RJ45 but I see 100 base TX/FX so this make me doubt about it because TX its for copper link and FX for fiber. [code]

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Cisco Switching/Routing :: 3560G Routed Port Connected To E1 Converter?

May 25, 2013

I have made a routed port on 3560G Switch and defined a pool and connected to E1 converter RAD (4E1 to 4 FE) the E1 media is through Microwave on the other end same E1 converter is connected through layer 2 switch and defined a pool as of routed port configured in 3560G switch.
The port is generating lot of giants and after a while it also distrubs other routes ( Port1 to Port 16), configured with Vlan11 and port 22 as routed port.I have checked the routed port through wireshark the maximum frame size is 1514 and configured the MTU to 1514, giants are not showing any more but after 10 to 12 hours switch gets hang. Either to shut the port or to reload the switch to get switch and other layer routes to be normal.
I have checked speed and duplex settings same as E1 converter. Full duplex. 100 Speed. Why switch is not behaving normal. If I shutdown the routed port it is normal.
1. interface GigabitEthernet0/22
no switchport
ip address
flowcontrol receive on


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Linksys Wireless Router :: E4200 Non-supported Device Is Connected To USB Port

Dec 16, 2011

I'm trying to connect an Epson Stylus Color 740 USB printer to a newly purchased E4200 wireless router.  I've upgraded to the latest Cisco Connect software and to version router firmware.  I get the message "A non-supported device is connected to your router's USB port.  Disconnect that device and follow the steps below to connect a USB printer to your router."  Cisco support was not beneficial. 

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Cisco Switching/Routing :: C2960S / Prevent Traffic Per Port Or Inside VLan

Nov 27, 2012

I want to know what is the best way to black traffic inside the same VLAN, this VLAN is a user VLAN, it means that I am talking about access layer.I wanted to use private vlan, but C2960S doesn't support this feature. Any other way to prevent any to any traffic in the user vlan, this vlan only have to speak at the Layer 3.

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Cisco Switching/Routing :: How To Limit Broadcast Traffic On 3560 Switch Port

Dec 17, 2012

How do I limit broadcast/mulitcast traffic on a switchport to e.g. 5000 pps ? I don't want the port to shut down, just block or drop broadcast traffic that exceeds 5000 pps.

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Cisco Switching/Routing :: Unexpected Traffic On Nexus 5000 Trunk Port?

Feb 6, 2013

So I took a laptop with wireshark and plugged it into a nexus 5000 port that is configured as a trunk with 3 vlans allowed on it. The laptop was seeing all kinds of traffic on the wire, most of it was not involving my laptop.
For example: Server A VLAN 10=  Server B VLAN 20= and wireshark laptop is plugged into a trunk port which is allowing those vlan's. The vlan's are routable. is seeing the entire conversation when backs up even though it has no reason to see it. It is as if the trunk is spanning traffic to the laptop port. No span is setup however. It's really weird. This is not just broadcast traffic, but actual tcp taffic between Server A and B. Why would a trunk port see traffic between 2 other servers talking to each other on the vlan.
Trunk port configuration below:
Interface Ethernet 141/1/3 
switchport mode trunk
switchport trunk allowed vlan 10, 20

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Cisco Switching/Routing :: 3524XL Cannot Access Any Traffic From Gigabit Port Over Fiber

Nov 20, 2011

We have Cisco 3524XL switch, Motorola AXS1800 chassis. I am configuring this cisco switch so I can connect AXS1800 traffic thru cisco 3524XL, on switch port gigabit 0/1, I am using cisco Part no. WS-G5486 (1000Base-LX) connector to connect to AXS1800, both port are member of vlan 200 allowed, and configured dhcp-server, but still I can't ping any host or host can't get DHCP server.

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Cisco Switching/Routing :: 3750E - Sequestering Traffic On A Router-enabled Port

Nov 20, 2011

Is there a way to use the "no switchport command to enable routing on a port and yet sequester it from traffic on other vlans within the switch?
The switch in question is a 3750E

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