Cisco Switching/Routing :: GC2960 - Incoming Traffic On VLan Getting Lost?

Apr 11, 2012

We have a switch gc2960. It has ports configured on vlan 27 and vlan 29.It is connected to switch ch3550. It has presence of vlan 27 vlan 29 and also vlan 18 and several other vlans.Our internet firewall is connected to ch3550. It is a fortinet product, so this is not indicated on the diagram.
When the two switches were connected on vlan 29 access ports, pc's on vlan 29 on gc2960 worked as expected. vlan 27 clients of course did not work.When we switched the connecting ports to trunk ports, some weird stuff happened. Clients on gc2960 on vlan 29 could ping and resolve dns, but not browse the intenet. The same was true for clients on gc2960 vlan 27. We verified that packets from the web were coming in through the firewall. What we were thinking, is that they somehow were not being tagged to vlan 29 even though we were trunking.
When we set native vlan 29 on the trunk, then clients on gc2960 vlan 29 operated as expected. However, clients on gc2960 vlan 27 are still having this problem, we can ping and resolve dns but not browse.Consider the other switch ch2960-jstreet which has presence of vlan 18 and vlan 27. It is also connected on trunk to ch3550. We are not using native vlan on this trunk, and traffic works as expected.Is the lack of presence of vlan 18 a factor as to why gc2960 is not receiving the tagged packets correctly? Should the interface vlan18 on gc2960 have an ip address on the vlan 18 network?

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Cisco Switching/Routing :: 6513 Monitor Session Source Vlan And Lost Packets At Destination

Feb 20, 2012

We have 2 6513 switches with SUP720/PFC3A and various POE modules and a 6748-GE-TX  facing our servers.  Additionally, we have a 4Gbps portchannel trunk interconnecting the switches.    We have approximately 300 Nortel IP 1140e phones in use between the two switches.For the purpose of call recording, we've attempted to mirror the voice vlan using various approaches and have been met with limited success.  We mirrored the VLAN using tx, rx, and both.  When using both we appear to get duplicate packets at the destination interface.We seem to lose packets completely going in one direction or another for a given call. Packets are lost before they get to the destination interface?

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Cisco Switching/Routing :: 2960 / Traffic In Same VLAN Goes Up Trunk?

Feb 11, 2013

I have 2 hosts, 1 plugged in fa 0/21 in VLAN 101 and another in fa 0/22 in VLAN 101 on our L2 Cisco 2960.  If I try and transfer files from either host the gig 0/1 trunk port on the 2960 leading tot he 3750 fa 0/1 port hits 100mb (using a real time bandwidth monitor tool), but why?  This VLAN is on the same switch, why does it go one way up the trunk to the L3 3750 switch?  The L3 3750 is the VTP server and the 2960 is a client.  I would of thought the traffic stays local.  The 2 hosts don't even have a gateway set.To sum up the typology the 2960 and 3750 are trunked using a single cable.  The 3750 hangs of a ASA firewall using SVIs.Here is whatthe traffic looks like when copying a file between hosts (2gb file).
3750 L3 Switch (VTP Server)
  interface FastEthernet1/0/4
description Trunk to Cisco 2960 Gig 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate


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Cisco Switching/Routing :: 3750 - Only Allow Specific Traffic To VLAN

Oct 10, 2012

Have a quick question regarding inter-vlan routing on a 3750.  Overview of network is ISP --> ASA --> 3750 (acting as my core and default gw).  I have 5 vlan interfaces on my 3750, all w/ 192.192.x.x subnets, a 6th w/ 192.168.100.x, and a 7th w/ 192.168.200.x.  I have enabled "ip routing" on the switch and can successfully ping from subnet A to subnet B as long as both devices are using the correct DG for their vlan, which is the switch.  I have a few ports that are trunked as well that go to ESX hosts which break out the vlans according to the subnet the vm should be attached to.  The ASA is set to nat internal traffic for all the vlans.
Now my question:  short of applying an ACL to each vlan interface to block traffic from other 192.192.x.x subnets is there a better way to accomplish this?  I want my 192.168.10.x subnet to be able to reach all the subnets, but don't want 192.192.10.x to be able to talk to 192.192.20.x for example.  I was thinking to create an acl like this:
access-list 120 permit ip access-list 120 deny ip 120 permit ip any
and then applying this to the interface for the appropriate vlan. 

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Cisco Switching/Routing :: EDS 316 / 208 - Network Don't Permit Traffic UDP In VLAN

Jul 17, 2012

I have problems in my Cisco network until I connected some Moxa devices.This Moxa are models EDS-316 and EDS-208
My principal trouble is the traffic UDP. Suddently the network don't permit the traffic UDP in VLAN where are connected Moxa devices.
During an hour the Moxa can send TCP traffic, but can't send UDP. If a Moxa device is unplugged from network, all devices connected to him can work offile from principal network, but if I plugg again the Moxa is like disable.
After one hour (more or less) the system restart all functions and work fine.I catch the logs from TXerrorsInPorts and all the ports where is connected a Moxa have errors all time.
I don't know which is the problem, but I think that problem is in negotiation from Moxa to Cisco.This is the configuration from a port where is connected a Moxa: [code]

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Cisco Switching/Routing :: 4507 - Monitoring All Traffic From VLAN To Cloud

Jun 14, 2012

I have a requirement to monitor all traffic going from the internal LAN to the cloud.  The LAN is a layer 2 VLAN  which spans multiple Cisco 4507 switched and other smaller switches.
The VLAN has an IP address which the hosts use as the default gateway.
The exit port is on a Cisco 3600X switch connecrted to 4507 #1 via a 10G fiber link. 4507 #1 connects the rest of the LAN. Those switches interconnect via 10G fiber and 1G copper links.
Currently the monitor host is connected to a 1G copper port, configured as a monitor port,  on one of the backside 4507s The switch manager says he has the switches configured so that I can see all traffic on the VLAN.

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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 :: 4900 Capturing VLAN Traffic And Set Destination To GE Ports

Jan 24, 2012

At present we are having a 4900 series switch where we are running one monitor session.Additionaly we are in need of capturing VLAN traffic and set the destination to 2 * GE ports , both are in the same switch.Due to the limitation of two monitor sessions per switch , we thought of putting the destination ports as port channel but it looks like it is not supported.

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Cisco Switching/Routing :: Block / Permit Intra Vlan Traffic On 3750

Feb 21, 2013

I have One switch 3750 and many switch 2960 c.I use one ASA 5510 to reach emote branche site (vpn conexion).I use one router 1841 for internet conexion.Router 1841, ASA and catalyst 2960 are connected on the 3750.Default gateway of all user is ASA IP
I configured Vlan 3750 and it work.Now I need to implement security : permit/block specific traffic between vlan [code] From vlan 72 I cannot have remote access on computer in vlan 34 and I cannot ping computer in vlan 34.

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Cisco Switching/Routing :: 2960G / 3650G - Non-broadcast Traffic Appearing Across VLAN

Jul 5, 2012

We run a network of several 2960G and 3650G switches in a network with a number of VLANs. One one particular VLAN (let's call it VLAN 10) it appears that non-broadcast traffic (i.e. normal unicast traffic) is being copied to every port in VLAN 10 only on one switch . The traffic is not crossing trunk ports and does not appear on other switches that have ports in VLAN 10. We first spotted this by noticing that a UPS port had an unusual amount of activity on our port througput graphs:
This traffic at 4 am is not expected and this profile is repeated across all ports in VLAN 10 on this switch (a  WS-C2960S-48TD-L stack running IOS 15.0(1)SE3)\iffed one port using local SPAN (the UPS port) and discovered that this traffic was not broadcast, which was running at a normal low rate at all times. The traffic appeared to be unicast traffic from other ports of the sort you might see on a hub. It was from various hosts that live on VLAN 10, most (not all) of the conversations had one end station homed on the 'problem' switch. There are about 800 non-broadcast packets per hour and this is a busy VLAN so it does not account for all the traffic on the VLAN.

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Cisco Switching/Routing :: Net-flow Not Reporting Egress Traffic On 6509 Vlan

Nov 27, 2011

We have a pair of 6509 working in a VSS configuration (IOS 12.2(33)SX5). The 6509s connect to a pair of ASAs (7.2 code) running in an Active/Standby setup. These ASAs in turn connect to routers going to remote sites. I have configured Netflow on the following VLANS,
VLAN 10 - Servers Vlan
VLAN 9 - Transit/ASA VLAN (connects ASAs to 6509s). All traffic originating from any VLAN on the 6509 crosses this VLAN in order to reach remote sites and vice versa
I configured the netflow source VLAN 11 although I am not collecing any netflow from it.Although I have been getting lots of Netflow info, I noticed that netflow for traffic originating from any user VLAN on the 6509s going to any remote site via TRANSIT/ASA VLAN(9) does not get reported, I even tested with 4 GB traffic but no result. Only reverse traffic (i.e. from remote site to user VLAN) is reported as it traverses the Transit VLAN (9).
I read somewhere that egress netflow is not supported in 6500, but isnt traffic originating from a user vlan to a remote site via the transit VLAN (9) considered ingress with respect to the transit VLAN (9)? I would like to know whether bidirectional Netflow is supported on 6500 VLANS. I have mimimum control on routers beyond the ASAs, and since these ASAs run 7.2 code netflow is not supported, and Monitoring this Transit Vlan gives me extremely useful info.
I do get netflow biderectional traffic from the Server Vlan 10, but I think it is correlated by the netflow collector from vlans 9 and 10. [code]

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Cisco Switching/Routing :: Setup VLan To Allow Video Traffic Between 2960 And 3750?

Nov 13, 2011

I am trying to setup a network using Cisco 2960 switches with vlans configured.  One vlan will handle video coming from four cameras that are connected to another 2960.
We have four cameras feeeding one port each on a 2960, that 2960 in turn feeds one port on the main 2960 which is the video vlan for that site.  From the site it goes back to a Cisco 3750 to be sent over to a Sonicwall firewall. If we connect to the 2960 that the camera are connected to we can see the video, but not on the main site 2960.

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Cisco Switching/Routing :: Sonic Wall 3060 - Filter Traffic From VLAN Through ASA?

Dec 18, 2011

I'm decommissioning my SonicWall PRO 3060 and upgrading to an ASA5550 (we're increasing our WAN link speed to 1Gig and need the 5550).  In any case, I want to copy over the configuration from the PRO to the ASA.  I have everything documented and I've started doing the changeover, but in looking at some other network diagrams on the net I'm seeing router symbols between the LAN switches and the ASA and I'm beginning to worry that I might need routers to do this which, of course, would increase cost quite a bit.
So my question is this: If I have a core switch carved into multiple VLANs and I connect each VLAN to a port on the ASA, will I be able to route and filter traffic from VLAN to VLAN through the ASA?  If so how, in general, is this accomplished (I'm betting ACLs).  I think that the ASA will be able to do this easily, but I just want to be sure before I get too far into the configuration of this unit,.
               GigE0/0          GigE0/1          GigE0/2          GigE0/3          GigE1/0          GigE1/1          GigE1/2          GigE1/3
                    |                    |                      |                      |                     |                     |                     |                     |
                    |                    |                       |                      |                     |                      |                     |                     |
                WAN          BackupWAN                                                  VLAN400        VLAN500        VLAN600         VLAN700

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Cisco Switching/Routing :: 5596 VLAN Traffic Span Across Vpc Peer-link

Apr 22, 2013

I have pair of 5596 switches in vPC. One host say "HOST A" is connected to the primary vPC peer and other "HOST B" on secondary vPC peer.Both are in same VLAN 10. Both hosts are vpc orphan ports as their NIC is configured in active/standby mode.I have configured span session on both vPC peers with span source as VLAN 10 in rx mode.Span destination is connected to secondary vPC peer. The issue here is that I am not able to capture the traffic originating from HOST A destined to HOST B which is traversing vPC peer-link.Same issue occurs for the traffic in reverse way and span destination on primary vPC peer. In a nutshell, any traffic which crosses vPC peer-link is not getting captured.
What could be the issue and is there any solution for it. Below mentioned is the span config and relevant interfaces. [code]

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Cisco Switching/Routing :: Intra-VLAN Traffic Not Passing Back To Nexus 5k

Mar 28, 2013

We recently extended our access layer using a pair of 5ks with extenders. We have a pair of 6509s at our core and they handle the intra-VLAN routing with SVIs. I recently noticed that access hosts connected to the extenders cannot pass traffic between each other if they are in different VLANs. The strange thing is these same hosts can ping devices in other VLANs as long as the other devices are not connected to the 5k environment.
For example, consider the following hosts. Each host has their gateway set to the appropriate SVI on our core.

HostA - VLAN100 - connected to 5k extender
HostB - VLAN200 - connected to 5k extender
HostC - VLAN100 - connected to 2960 off our core
HostD - VLAN200 - connected to 2960 off our core
Each host can ping each other with the exception of HostA and HostB. As for specifics, we use HSRP (no VSS) between our cores.
When I ping between hostA and hostB, I see the egress packets on either 5k1 or 5k2. I then see ingress AND egress on Core1. There are no ingress packets on 5k1 or 5k2.The egress packets from Core1 show the correct destination MAC address of the target host. The mac address table shows the mac address on po31.

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Cisco :: Routing Traffic From Non VLAN To VLAN On Same Interface?

Nov 21, 2012

i'm going mad on following problem. I'm trying to get 2 networks seeing each other while one of the network is a non VLAN network and the other one is a VLAN network.They should use the same interface so i added VLAN e0/0.122 to the interface e0/0.Send a ping from my asa to both gw-IP's made me happy at first. In second in figured out that i cannot reach any client in the other network. For testing purpose i created an permit acl to any/any for both networks, but the packets still get dropped by the default implicit rule. (deny any/anyMaybe i'm to stupid for this

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Cisco Switching/Routing :: 3750 - Show Interface Vlan (ID) Doesn't Show In / Out Traffic Rate

Mar 13, 2013

I have configured a vlan interface on a 3750 switch. there is aprox 4Mb active traffic flowing through the interface, but when I do a "show interface vlan (vlanid)" the output show zero bits in and zero bits out. Its a typical L3 config with one IP on the vllan interface acting as the gateway for the VLAN devices. Is this a normal behaviur ? and if so is there any way to get the traffic in/out stats. The end PC/devices are connected to this switch via an L2 TRUNK and I dont have access to the L2 switch on which the actual devices connect. so cant get the real time stats of those interfaces.

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Cisco WAN :: Incoming NAT To VLAN On 1941?

Jan 26, 2012

On our Cisco 1941, we have 2 gigabit ethernet ports and a 4 port fast ethernet switch EHWIC card configured as follows:
GigabitEthernet0/0 131.x.x.81 - internal
GigabitEthernet0/1 131.y.y.234 - WAN
Vlan2 - LAN2, NAT inside


I have tested using some UDP packet sending/receiving software (which works through another router), and the packets just aren't getting through. Likewise trying to telnet into the external IP on port 80 doesn't get through to the destination server.
It feels like the route doesn't exist between the Vlan 100 and Vlan 2 when it's coming in, or maybe there's an ACL needed for the incoming traffic? 

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D-Link DIR-600 :: Block Incoming Traffic From An IP?

Aug 20, 2012

I would like to block incoming traffic from a specific ip on a specific port

This is what I have

source: interface: wan ip address range: - second one is empty (valid ip instead of x's) protocol: tcp

dest: interface: lan ip address range: both fields empty port range: 139 - empty field

ON and DENY box is ticked name field has some text in it

I click save and get this pop-up: Incorrect source ip address. Invalid format of the start IP address. Current Firmware Version : 2.11 The ip is obviously valid, what should I do?

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Cisco Firewall :: How To Log Incoming Traffic (SMTP) On PIX 515E

Mar 6, 2013

I'm new to ASA's and PIX units. I've setup a few VPN's now but know next to nothing about logging on these units. I read the config guide for the PIX, but cannot figure out how to get a log of incoming SMTP traffic going on the console.Do I need to use a SYSLOG server? I can probably set one up on my laptop.

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Cisco Firewall :: ASA 5505 Not Allowing Incoming Traffic

Mar 15, 2012

I am trying to switch out a cisco pix 501 firewall with a cisco ASA 5505 firewall.  I am not very familiar with all of the commands for the firewalls and have always relied on a standard command line script that I use when building a new one.  Unfortunately, my script is not working with the 5505.  What I am doing wrong with the following script?  I've masked public IP info with and I run it right after restoring the firewall to the factory defaults.  I am able to get out to the internet if I browse directly from one of the servers, but cannot access a web page when trying to browse to it from an outside network. [code]

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Cisco Firewall :: ASA 5520 Cannot Block Incoming Traffic

Dec 12, 2012

I was configure 3 interface on ASA1st - managemetn (only for management)2nd - gig0/0 is connected to internet with real IP3rd - gig0/1 is connected to local networkI was configure routed NAT to internet.But I have problem with restriction incomming traffic to inside interface (ifname is inside)but I can connect to ip address of inside interface from other ip. It is wrong and i can't understand where is my mistake.

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Cisco Firewall :: ASA 5510 - Find The Receiving End Of Incoming Traffic?

Jul 3, 2012

We run a Cisco ASA 5510 and i need to find out how i can find the receving end on the inside of a vlan for traffic comming from outside.
ie incomming traffic on port 3937 and are NAT to eth 0/1.10
Thers a bunch of traffic on one port 33771 udp going in on how do i trace this to the inside computer ???
lets say incomming traffic is on and this is on eth0/0 this ip is NAT to a Vlan on the side for with a subnet of

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Cisco Infrastructure :: Catalyst 3750 - Creating ACL / Incoming Traffic?

Jul 10, 2011

We have the next Settings in our SW. We crate an ACL and aplied to a SVI for Incomming Traffic, I understand that is not necesasry to allow the returning traffic in ACL, but we can't access to rdp for example when we add the ACL, if we remove it, the acces is ok, buet when we add again the access is deny, even we have a log entry, and the ACL i just for Incomming traffic. There is no another ACL.

See attached file


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Port Forwarding Working For Incoming Traffic But Not Outgoing?

Feb 6, 2012

I have a licensing server. Other computers need to turn on a program, they send a message to the licensing server, and it responds that they have permission to run.Until today the licensing server was plugged into its own ethernet wall socket and configured with a static IP address. Today I put a router into that wall socket and now the server's plugged into the router.The router (WRT-54G) was set to the static IP - and now the internet on its network works. I set all ports to be forwarded to the server's internal IP address - and now my programs can detect and ping it. But now the server won't send back permissions to use licensed software, or even reply with a list of the software which it can license.

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Cisco Switching/Routing :: Configure 881 To Split Incoming Internet Connection Between Two ASAs?

Jan 15, 2013

is it possible to configure a Cisco 881 router to split the incoming internet connection between two ASA's? If one ASA fails then the router would switch traffic over to the second ASA. The 2nd ASA would takeover from the primary ASA through the active/standby failover configuration and crossover cable. I'm trying to avoid configuring the switch to control the traffic using VLANS if possible.

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Cisco WAN :: ASA 5505 - Forwarding All Incoming Traffic To Two Internal HTTP Server

Oct 2, 2011

We have Cisco ASA 5505, 90.x.y.2/29 IP is assigned to outside interface. We have one internal HTTP server so that I use static (inside,outside) tcp interface [URL] to forward all incoming HTTP traffic to internal HTTP server 1. Now we need to add new physical HTTP server 2 so that I would like to forward

HTTP traffic to e.g. 90.x.y.3/29 to
How can I do that? See scenario image (scenario.png) if needed.

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D-Link DIR-600 :: Block Incoming Traffic / How To Create Rule Source

Jun 23, 2011

I need to block incoming traffic with Dlink DIR 600. I know how to create the rule source (WAN) to destination (LAN)  to deny all protocols. But what IP will I put in WAN? IP address of my Internet? Or how can I enter the ALL IP range in source...format for the IP (it's not

I want to do this because in the DIR log section I'm being PING Flooded.  I already un-check "Enable WAN Ping Response" but still receiving the message.

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Cisco Firewall :: ASA 5510 Stops Forwarding Incoming Traffic To Internal Servers?

Dec 5, 2012

Since the power failure two days ago, my -ASA stops forwarding traffic to internal servers, for no apparent reason. Packet trace shows all OK, packet capture buffer stays empty when I try to http into the mail server. The only way to get it working is to change the Outside Ip to the one used for mail, then to change it back. It will work OK for a few hours, then stop, with nothing obvious in the logs.

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Cisco Switches :: Routing Vlan Traffic Out From SGE2000P

Nov 1, 2011

We have one SGE2000P switch that we are testing in Layer 3. We have a very simple configuration with some vlans that we want to route to our corporate network, but I want to test if there is actually traffic coming out from the up-link port first.
1- Created the vlans:
 VLAN1: /16 (native)
VLAN10: /24


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Cisco Firewall :: ASA 5520 / Monitor Largest Outgoing And Incoming Traffic Per Ip In Real Time?

Mar 4, 2013

We have a Cisco ASA 5520 and im looking for a way to monitor largest outgoing and incoming traffic per ip in real time so to know which of my internal computers are using the most of our Internet Line. Is there a way to this through ADSM ? We use version 6.3.

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Cisco Switching/Routing :: 3560 Possible To Create Vlan Inside Transport Vlan?

Jan 10, 2012

Between our hosting and a customer we have an extended vlan, traveling on a fiber, between two cisco 3560 switches.The thing is, that we want to create one or more vlans inside that extended vlan, in some way if possible?

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Cisco Switching/Routing :: 3750 - Extending VLAN To Remote Switch That Already Has VLAN ID In Use

Jan 10, 2013

I have two networks at two sites with a dot1q trunk between the two L3 switches at both sites (no routers involved)
SITE A - Cisco 3750 L3 - VLAN ID 50
SITE B - Cisco 3750 L3 - VLAN ID 50
I would like to extend the SITE A VLAN to SITE B so that I can move hosts from SITE A to SITE B without needing to change their IP address but the vlan ID is already in use. Obviously the easy solution is to change the VLAN ID for one or other of the sites but both sites contain hosts that run 24/7. Is there a way to join two VLANs with different IDs together.So for example I create a new VLAN 60 at SITE B and associate it with VLAN 50 at SITE A.

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