Cisco is a major provider of switches and routers to most medium and large companies. Cisco devices often run IOS or NX-OS. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.

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65 views

Is it possible to increase the size of RAM of a CISCO UCS blade server?

We have a Cisco UCS Server which has 256GB RAM and installed with Win 2008 Server 64bit. I wanted to know can we upgrade its RAM to 512GB RAM? Is it possible to do that or do we need to build a new ...
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1answer
171 views

Cisco SG200-26 - Can't change management VLAN

I've purchased a new SG200-26 switch and upgraded it to the newest possible version: I configured multiple VLANs - nothing special - however if I try now to change the management VLAN (as I did ...
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1answer
65 views

Putty blank when connected to Cisco Catalyst 3500

I'm using the normal blue RJ45 to DB9 cable plugged into my Cisco Catalyst 3500 series XL switch. That cable is connected to a serial-to-usb adapter that I got from Monoprice, and that is plugged into ...
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1answer
15 views

Cisco ASA5505 compatible RAM

I have a Cisco ASA5505 which I've acquired. It boots up first time successfully, and works without issue, however as soon as I reboot, it fails to boot with the flashing light sequence which indicates ...
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30 views

Cisco 1941 EIGRP UP DOWN

We have two cisco routers 1841 and 1941. The 1841 keeps generating "holding time expired" and "interface goodbye recieved" about its neighbor the 1941. The VPN IPSec protocol seems to stay up. ...
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21 views

ip dhcp excluded-address command no work

I want to provide 1.1.1.101 to 1.1.1.126 using dhcp pool. Here is my configuration no ip dhcp use vrf connected ip dhcp excluded-address 1.1.1.1 1.1.1.100 ip dhcp excluded-address 1.1.1.127 1.1.1.254 ...
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45 views

ICMP DDoS, proper ACL?

We are having about a 3-4Gbps ICMP flood on one of our servers and I wonder.. I have a 20gbps of DDoS protection but the proetction seems ineffective against ICMP funnily (it worked well to block a ...
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18 views

high ping6 latancy for cisco C3750

I have one cisco router with IOS software ( IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(55)SE1). Recently, there is big ping latency, when I ping from one HP Gen6 SERVER which ...
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1answer
19 views

limited connectivity at end nodes

I am running a campus wide network of a University and experienced a very unusual scenario for my network. The problem is two folds and therefore i would like to explain that separately after briefly ...
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52 views

Real time Rssi from Clients from a Cisco WLC

I have a Cisco WLC and different LWAPPs. What I am looking for is a way to be able to get in the WLC the rssi of all connected clients. For the moment I am able to access through SNMP to the ...
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1answer
25 views

How Can I Have 1 Device Ignore Cisco Default Route?

I have a two building infrastructure that I need a few access point devices in Building 2 talk to the default gateway in Building 1. Each building has its own firewall. Each building is connected ...
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14 views

Long Response Times for Reads via FCoE

We're getting some intriguing performance with our new FCoE environment, and I was hoping that people could let me know if what we're seeing is expected behaviour. Our switching environment consists ...
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1answer
39 views

Cisco switch can't log off VTY user

I have a Cisco 3821 switch sitting on the edge that has 4 connections from China that can't be booted off. c3821:#sh users ... 12 vty 11 idle 1y40w ...
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1answer
514 views

Can a Cisco SG300 Layer 3 Switch act as a NAT router?

I have following Network Setup: Basic Home Wifi Router ------------------------------------------------ | Cisco 2500 Series Wireless ...
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17 views

Cisco 1921 ISR K9 with Cisco 2620xm failover

I have a Cisco 1921 ISR and a Cisco 2600 Router (2620xm). The C1921 is the primary router on the corporate network. I would like the Cisco 2600 to connect to a module on the C1921 and provide 2 ...
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1answer
32 views

Windows Domain Network, Cisco 1921 ISR, and NTP

In an effort to make sure all Windows application that rely on time work (such as RDP), and to make sure logging between computers and router are using the same times, I would like to use NTP ...
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1answer
92 views

VMware remote virtual serial port concentrator

I'm setting up a Cisco virtual wireless controller using the guide provided here: http://www.labminutes.com/wlc0001_vwlc_7_3_vmware_installation The narrator talks about making sure your VMware is ...
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2answers
222 views

Port-scanning on Cisco router with Nmap

I have Cisco 2911 router just booted with factory settings and no ACLs or NAT configured. All I did is turned on the interfaces and assigned IPs. I am trying to scan for open ports with Nmap, but the ...
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39 views

SNMP table for physical interfaces Cisco routers

For monitoring purposes, we are querying via SNMP the ifTable of our Cisco Catalyst routers. But virtual interfaces, like vlans are also returned, this list can become quite long, but even more, it ...
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1answer
93 views

Meraki Switch Uplink

Bare with me as I am not the greatest at networking and vlans but i can usually figure it out if i can find info. I have a new switch from Cisco Meraki (MS220-8P) and i am trying to configure a Dual ...
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1answer
39 views

How to access integrated switch module of a Cisco 3850 Router

I have a Cisco 3850 Switch with the 48-port switch addon module. Both the router and the switch have a IP address and telnet enabled, but telnet recently stopped working on the switch module. I can ...
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2answers
85 views

SSH'ing from a different subnet. The router does not seem to route correctly

An EDIT was made at the bottom I have a macbook on 192.168.12.x subnet, and a debian machine with apache2 server with ssh enabled sitting on 192.168.1.x subnet. The debian machine has a static IP ...
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1answer
296 views

Cisco BGP Unequal Cost Load Balancing

I'm trying to implement BGP Unequal Cost Load Balancing feature in my network. According to cisco manuals (long: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fsbgplb.html, short: ...
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39 views

Cisco 2960-X switch converting unicast video stream to multicast video stream

Can we convert unicast video stream to multicast video stream just using Cisco 2960-X switch ? Note: I tried to route incoming stream to 235.6.6.6 as it is my multicast ip adress, I used. In order ...
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14 views

Allow tcp traffic on certain ports from certain IP addresses with Cisco router

I have a Cisco 887 router where I want to allow tcp traffic from a set of external IP addresses to one of the servers on the inside. Further more I only want to allow traffic to certain ports. E.g. ...
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33 views

Cisco 2960G switch console username. Cannot login

I have a Cisco 2960G switch and I have configured a line console password on it. But I have not set a username and when I attach a cable to the console port I am asked for a username, but I cannot ...
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77 views

Is it possible to access inside server using outside address from dmz an a Cisco ASA

We have a Cisco ASA 5506-X (running ASA 9.5(1)) and a /28 public network. The first available address in the public network is assigned to the outside interface of the ASA and has NAT/PAT to several ...
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0answers
18 views

Cisco Unified Presence Server - Update Lync Status value for In a Call

The default value in Lync for a busy status is numerically represented as 6500. Is it possible to change the "In a call" status that the Cisco Unified Presence Server provides the Lync server.
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1answer
30 views

IP NAT from router to SSL-VPN appliance

Has anyone use Cisco 891-K9 to forward 443/SSL to a SSL VPN appliance? (I've never encountered this situation before because either the public facing router terminated VPN directly or we had multiple ...
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1answer
106 views

Tagged and Untagged Cisco vLAN port

I have a whole bunch of Dell switches I support and most of our users have a VOIP phone on vLAN 999 and a PC on a couple of vLANs. On the Dell switches I simply set the PC's vlan to untagged and then ...
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1answer
63 views

How to find out from which switch is coming the exact MAC address

I am working on a big company with 2 Backbone routers (ARS9K) and 200+ switches (Cisco, D-link, Tp-Link and etc.). Lets say that I know an exact MAC address of a device, but I do not know to which of ...
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20 views

How to connect internal IPv6 to IPv4 network

For the past few days Im having "fun" checking different NAT configuration options on srx240. Im looking for a way to enable lab PC connection to internet. Is it possible with this spec, or do I have ...
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80 views

Unknown root user on Cisco 1921 router

Just a moment ago I ran the who command on my router and I noticed myself logged in on vty 1 but another user root was on vty 0. The Location under that user is some location I do not know (someone ...
2
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1answer
267 views

Possible Cisco Router Hack?

We have a Cisco EPC3928AD EuroDocsis 3.0 2-PORT Voice Gateway from our ISP. The router is connected to a firewall (an Ubuntu-box running iptables and Wireshark). Our LAN (10.0.0.1/24) is beyond the ...
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5 views

Cisco IPSec OSX multiple user accounts

Is it possible to force a Cisco IPSec Connection to prompt for UN/PW before login on OSX 10.10? I want to store the VPN Connection on the OSX machine, but I want users of that device to enter their ...
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29 views

Cisco ASA Static NAT RULE Problem

I need to clarify a one of cisco asa NAT rule. i searched lot and still not found a clear answer. please see below rule • nat (Inside,Outside) source static any any destination static ...
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177 views

CISCO port tracing by LED light blinking

I work as IT technician,part of my job I have to trace the UTP cable to the switch port, I used for the a program called WinCDP by connecting to my laptop Ethernet port and it will tell me where is ...
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66 views

How can I use openscap to do an offline OVAL scan of a Cisco router?

This doc describes a process of scanning a router's "show tech" file with a joval utility. I downloaded joval's trial, but didn't see that utility. Can openscap do offline OVAL scans of Cisco ...
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1answer
99 views

Adding 4th scope to DHCP and make a superscope in windows 2012

Hope someone can shed some light here. I have a little network drama which I'm trying to get resolve as soon as possible. To give you a little background; We have CISCO SG300 small business switches ...
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2answers
468 views

VMware - VM not getting DHCP address after reboot

We are having a strange behaviour in our ESX-cluster: The Infrastructure: we have 2 ESXi 5.5.0 build 2718055 in a cluster, managed by vCenter. We are using an Essentials licence, so we do not have ...
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1answer
360 views

SSL/TLS Cert for Client VPN - Meraki

Hoping you can help me out here. I am attempting to setup a client VPN through our Cisco Meraki MX80 security appliance/router. I plan to use the Active Directory Authentication option so that users ...
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25 views

Something like WSUS but for Cisco routers?

A Windows Update Server will automatically download Windows updates/patches to a central repository and then the admin can pick and choose which patches to push out to Windows servers. Is there a ...
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1answer
54 views

Unable to connect to the internet with cisco 2911 using computer

It appears to be a NAT issue but I'm completely at a loss as to why this is not connecting. Cisco g0/0 192.168.42.5/24 <-> Wireless WAN: 192.168.42.1/24 Cisco g0/0 - shutdown Cisco g0/2 ...
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1answer
184 views

How to change broadcast-flag in Windows or Linux?

As we know there are 4 types of packets involved when a client wants to get an IPv4 address from DHCP Server. These can be seen in the image bellow (from Microsoft web site). From the perspective of ...
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2answers
96 views

Best practice for using multiple links between switches when link aggregation is not supported?

I have a half-dozen servers and workstations in an office. The systems are connected to a Cisco SG200 gigabit switch in the room. The room has two gigabit wall-port ethernet outlets. I have the switch ...
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73 views

Connecting 2 single switches to a stack

I have a core switch made with 2 stacked Cisco SG500XG-8F8T switches. Now I have to connect 2 3Com Baseline Switch 2920-SFP Plus to extend my gigabit network, but they are not stacked. So I connected ...
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15 views

About to buy Cisco ASA 5506-X [duplicate]

I'm about to buy my first Cisco router and intend to buy the Cisco ASA 5506-X. From reptuation, I've rightly or wrongly, got the impression that Cisco love to bolt on subscriptions for things. When ...
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18 views

Can't change Cisco ASA Easy VPN Server Address - no changes were made

I am trying to update an Easy VPN Server address (it is changing) via ASDM, however when I enter the new address and click Apply it says No changes were made. Any ideas how I can change this please? ...
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2answers
65 views

Routing/gateway problems in a simple topology

In order to have a second "backup" gateway for my company network, I tried to implement this topology: It is pretty straightforward, with the network between the modem and the router being the ...
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2answers
104 views

Static IP settings wrong? Why?

I have this issue when I try to copy files over my network (from PC to NAS). The first file seems to copy without a problem until it reaches 99%. It hangs for minutes and fails eventually. Let me ...