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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11 views

high cpu usage on 2811 router

there is high cpu usage and high intterupt rate on 2811 router while there is low rate traffic about 10 Mbit. How can i fix this problem. output of sh processes cpu sorted 5sec | exc 0.00 command that ...
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28 views

How To Stop Cisco ASA Spoof Attack

I have thousands of "Deny TCP reverse path check from 10.60.60.X to 10.60.6X.X on interface outside" The IP addresses for the source and destination hosts are all over the board, and the interface is ...
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0answers
12 views

Cisco 887 router as an IKEv2 VPN server?

A follow up to this question. The scenario is exactly the same, but I replaced my 877 router with a 887VA running IOS 15.4. The VPN server configuration works exactly like before, and I can ...
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0answers
14 views

Block Wifi Association by MAC Address on Cisco 881w ISR [on hold]

I want to block certain devices from connecting through wifi through the integrated AP on the Cisco 881w. I tried the procedure here, but instead of blocking one MAC address, it blocks all. Any ...
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1answer
19 views

Cisco CGS2520 switch to reveal MAC address when port goes active?

Is there a way to have a Cisco switch reveal the MAC address of a device via Syslog when it is plugged in? I get messages that a device is connected, but there isn't a lot of detail: Sep 9 12:50:51 ...
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1answer
18 views

Cisco 10GB-T module port duplication issue

I purchased one two port 10GB-T ports network module (C3KX-NM-10GT) for my 3750-X switch stack (4 in the stack). After powering off the entire stack, plugging the module in, re-powered everything. ...
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3answers
58 views

VLAN planning and questions

I currently manage an environment with IP addressing of 10.10.10.x/23. We have 3 VLANS set up, and I use that term very loosely. The reason I say I use the term loosely is, the 3 VLANS have full ...
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1answer
31 views

Juniper with multiple DHCP pool connected to Cisco switch

Newbie question: In our law office we have the following setup: Juniper SRX connected to Cisco L3 switch via trunk port. Cisco switch has: VLAN 5 range: 10.4.0.10 - 250 /24 VLAN 6 range: ...
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19 views

What's the best way to test a new config on Cisco 871?

I'm troubleshooting random connection problems and I've received some suggestions at the Cisco support forums. I thought to make edits to a local file and upload, but then I recalled the instructions ...
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20 views

squid3 wccp2 setting up gre tunnel from squid proxy to router

I am trying to setup a gre tunnel between a squid 3.1 proxy on linux debian, and a cisco router. I want to have web requests to port 80 to pass through the proxy first. I have created a gre tunnel ...
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13 views

ASA 5505 VPN unsuccessful

I am trying to connect to a VPN set up by our client. I have configured our new ASA 5505 successfully. The connection to the VPN is successful, however I can not access there internal network. I have ...
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24 views

DNS options on Cisco switch providing DHCP

At the company work for we decided to move DHCP duties from a Windows server to our 3750-X switch stack that's the gateway for our network. I researched the commands needed and cobbled together the ...
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0answers
25 views

Connecting to Access Switches Management Console via SSH

In a typical lab setup: [USER] -> [Cisco 2960X] -> [Cisco 3560X] -> [Firewall] -> [Router] 3560X carry all the internal routing, VLANs and is the VTP server. It has below IP settings: Management ...
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1answer
40 views

Completely block access to Cisco

There is Cisco Catalyst 3850 (WS-C3850-48T-E) which is managed only via management port. There are several VLANs on the switch. Also the switch works as a DHCP server. SNMP & SSH are already ...
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0answers
28 views

Reduce Bandwidth on a cisco router (Cisco 877)

PS:Sorry for my english i'm french so i'll try to write the best as I can. I looking since a few weeks now for a command to reduce the bandwidth on a cisco router. I done try a lot off command and ...
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0answers
20 views

Freeradius and Cisco. VPN client public address attribute

Once again I am here with a FreeRADIUS question. I use RADIUS for authentication of my IPSec clients and the NAS is a Cisco router. I want RADIUS to be writing not only the NAS IP address into the ...
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0answers
28 views

How can I allow NAT from inside to outside and vise-versa when each of my clients will have only one static public IP using an ASA5525-X?

My network topology is pretty basic. My data center provides a router and added a switch just before my cage to provide connectivity to all of the racks. My rack takes the copper drop they provide and ...
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0answers
20 views

ASA failover mode switching from Active/Active to Active/Standby

We have two ASAs with failover set to Active/Active. This seems to work fine for everything we do except using VPN connections. It seems whenever the primary ASA fails over that all VPN connections ...
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0answers
30 views

Cisco 3560-X and Bind9 DDNS integration

Experts, In an infrastructure I'm currently working on, we have one Cisco 3560-X as a core switch and an internal Bind9 DNS server. The 3560 is acting as the DHCP server. BIND9 currently has names of ...
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0answers
15 views

Cisco ASA5505 Public IP Address

I am trying to configure a Cisco ASA5505. I am using the GUI start up wizard. When I assign the outside IP address to be a public IP address the configuration will work but after about 30 seconds the ...
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1answer
41 views

“dig +trace fqdn” and “dig fqdn” do not give the same result on a LAN with windows DNS server, why?

in my company LAN I have a Ubuntu 14.04 server running in Virtualbox (as guest) on a Windows 7 (the host) with network interface bridged (so the Ubuntu server belongs to the LAN, with its ip: ...
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2answers
415 views

error “illegal software format” in upgrade fw .ros file of Cisco Sg200-26 small business smart switch

I own 2 cisco switches small business switches. they are both SG200-26 26-port gigabit smart switches. One has fw ver. 1.0.0.19 , while the other has version 1.1.1.8. I am now trying to upgrade ...
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0answers
17 views

Report on how many received calls on Cisco unified CM

I've been struggling with this a couple of days now and I feel like I've seen every webpage about Cisco Unity CM but just can't figure it out... The request I got sounded fairly simple: We want to ...
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35 views

Inter-VLAN Malicious Code Scanning

I am trying to find an inbuilt solution on a Cisco Catayst 3750X Switch to scan all traffic routed from one VLAN to another for malicious code. The situation is that we currently have a development ...
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6 views

Firewall Ports for Toshiba CIX server

Other then SIP ports: 5060 and 5061 what other ports need to be opened to have a phone set up in a satellite office with via external IP address. Phone Server CIX100 Firewall ASA 5510
4
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1answer
48 views

What could cause TFTP reloaded Cisco `running-config` on 871 to fail?

Cisco CCP Write Configuration borked my 871w config while I was trying to setup port forwarding. I went through the basic steps to reconfig the router. I looked to see if I could just reset the ...
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1answer
86 views

CISCO UCS servers and linux

I've been given a CISCO ucs server to use (for a job a raspberry pie could do) with a LSI MegaRaid card in it (4 sas drives) and I'm having no luck at all getting Linux to boot off the RAID thing. It ...
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21 views

Cisco 2600 password recovery disabled

I have a Cisco 2600 that I'm currently using as a doorstop. The reason for this, is that it has password recovery disabled, and even after following 'resolutions' online, it's still just a pretty ...
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2answers
108 views

Cisco ASA SSL VPN options?

Disclaimer: I am not a network admin so I may be wrong here but I thought asking here would help. I'm a developer mainly on the .net framework as well as helping get a mobile intranet app working. ...
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21 views

How to fix stalled connection on large download

I have a cisco 1921 router performing routing and NAT function. Cisco 3750 is performing layer 3 core switching duties. Users are complaining about large file transfers being stalled (not dropped) ...
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1answer
50 views

Cisco Catalyst 3560 PoE 48 with setting interface to auto qos voip trust

All I'm trying to do is copy the running-config from a Cisco Catalyst 2560 PoE 24, to a Catalyst 3560 PoE 48. This is f0/1 from the original switch: interface FastEthernet0/1 switchport access vlan ...
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17 views

Cisco NAC Agent keeps refreshing: Compliance Module version is available?

I have Cisco NAC agent installed on my domain-joined PC. It keeps displaying the following update message randomly: Cisco NAC Agent Compliance Module version xxxxx is available. Do you want to ...
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1answer
45 views

Serving public IP-adresses through two ethernet ports with public subnets, while protecting some interfaces for remote access

Done a lot of research and it's all kind of confusing. Some switches are also firewalls, most firewalls seems to be routers, with or without their own switches, but they're all different depending on ...
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2answers
71 views

Cisco 881w AP password recovery

Hello I lost the passwords for my Cisco 881w and internal Access Point. I used the procedure here to reset the password on the router by booting into rommon and changing confreg to 0x2142. This ...
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33 views

Site to Site VPN - Openswan and CISCO A2A

Below is the diagram that the VPN connection between Openswan server and CISCO A2A. http://i.stack.imgur.com/yQBSw.jpg client A and B are remote hosts with static ips. client X and Y are behind the ...
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21 views

Cisco ASA vague error

I'm getting a very vague error from my cisco ASA that connects our VPN to a branch office running a cisco router. I was hoping some one could give me some incite into how I could possibly pull more ...
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26 views

SG300-52 Remote Management Layer 3 Connectivity

I have a brand new SG300-52. I was able to successfully access my switch remotely when on Layer 2 but once I switched to Layer 3 and reset the switch to factory settings I can no longer configure it ...
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20 views

Giving vpn users access to all connected sites

I have a cooperate network which is connected to the remote branches through MPLS network.I'm wondering is there any way that I can give access to VPN client users to access the resources on other ...
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1answer
35 views

Allow only one call on CIPC with multiple lines

I have CUCM 7.1.5 with a lot of CIPCs connected to it. Each CIPC has 3 directory numbers (for example 107, 207, 307) and incoming call can arrive on any of these lines. I have managed to allow only ...
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36 views

cisco VPNC + how to use install certificate file on linux

I am using Cisco VPN on windows , before I run the cisco vpn I execute the certificate file as customor.cer ( when I execute the certificate file need to answer on some next screens and finish ) , and ...
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0answers
31 views

Hyper-V 2012R2 Private Vlans and Cisco Swith

I have a trouble with configuration of Cisco Catalyst 3850 (WS-C3850-24T-E). Hyper-V server (2012R2) is connected to it. My issue is to separate the virtual machines on the Layer 2 Level. The virtual ...
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1answer
97 views

Configuring trunk port on Cisco Catalyst switch to serve DHCP settings for multiple VLANs

I am trying to configure a trunk port to serve single DHCP settings for multiple VLANs. I tried the following configuration, but to no avail. switchport mode trunk switchport trunk allowed vlan ...
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2answers
74 views

Can I run commands from a file uploaded to my Cisco ASA 5500?

I have to run a lot of ACL/access-group and network-object commands, and I have found a 1024 character limit for each command - even if it spans multiple lines. In code, I use 1,000 chars as the ...
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1answer
70 views

RSVP on Cisco, Understanding and basic configuration

I'm looking for some help about a basic configuration and use of RSVP QoS into a Cisco router (2901 series). Since I have no luck using RSVP into my main network, I have tried to make it work in a ...
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29 views

Cisco 3750 vlan mapping

I have a Cisco 3750. Each customer send's data to our switch with the same S-VLAN but a different C-VLAN. They are 5000 different customers all need connecting to a single PPPoE server. How can I map ...
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2answers
182 views

VLAN not working in trunk between SonicWALL and Cisco

This was caused by me forgetting about a switch. Continue reading only if you're very bored SonicWALL NSA 3500 connected to Cisco Catalyst 3850. The SonicWALL has "sub-interfaces" (VLANs) V2, V800, ...
2
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1answer
75 views

Cisco 2921 ISR Installation concerns

We are having a leased line installed by British Telecom, they have routed the fibre via our telecoms 'cupboard' (enclosed glorified cupboard in our reception area) which has no airflow and only 2 ...
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40 views

Ping through a specific device or peer, BGP vyos

I am trying to figure out how I can compare latency to an end-point between two or more BGP peers. I am running VyOS 1.04 (community vyatta) and was using the linux ping command through command line ...
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80 views

Cisco IP Phone TFTP Error/Timeout

I'm trying to get Cisco 7942G IP phone working on FreeBPX setup. It has issues with getting things over tftp. I tried hard reset thing and I'm getting this in tftpd log: [root@localhost ~]# tail -f ...
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0answers
18 views

Number forwarding Cisco CallManager Express

I would like to set up number forwarding on Cisco CallManager so that when, for example, "888" is dialled, the call is forwarded to "00912345678". In my scheme the leading zero is for an external ...