Questions tagged [ios]

The operating system used on the majority of Cisco's routers and switches; a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system. For Apple's mobile device OS, use apple-ios.

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IOS traffic-export equivalent for Junos

In IOS the traffic-export command allows you to take incoming packets and send them, unaltered, to a specific interface. Is there an equivalent way to do this in Junos? I've got a J-series 2350 here. ...
John's user avatar
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Cisco T1 Routing Help

Thanks to someone on this site I was able to get the Serial0/0 interface up. I now have: DCD=up DSR=up DTR=up RTS=up CTS=up My next challenge seems to be in the routing and/or PC ip setup. ...
Joseph's user avatar
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Cisco 1760 T1 Setup

My 1760 has a WIC1-T1 card in Slot 0 and the slot 0 "OK" light is lit. When the router boots it shows that it sees the T1 card. I would like to configure my T1. I received the following details from ...
Joseph's user avatar
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Cisco 2911 - problem with DHCP

i am configuring DHCP daemon on Cisco 2911. At some point i assigned address 192.168.50.50 to one box (using MAC address 'relation'). When I wanted to saved config - I got warning, that address 192....
bluszcz's user avatar
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4 answers
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How to start Cisco 2911 with presaved configuration?

I briefly configured branch router Cisco 2911 and saved config. Unfortunately - after rerun Cisco needs "copy startup-config running-config" to read configuration (I really need this - for example to ...
bluszcz's user avatar
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IOS not saving evaluate rule in access-list

I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit ...
DeeJay1's user avatar
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Cisco 851 (IOS) router: FastEthernet 4 (WAN) got the shutdown flag

At a customer location there was a Cisco 851 router (which uses IOS). The PCs on location were all of a sudden unable to connect. We came on site and found that FastEthernet 4 (the WAN port) was "...
700 Software's user avatar
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Cisco IOS BVI ACL: Only allow established UDP

Related: Cisco IOS ACL: Don't permit incoming connections just because they are from port 80 I know we can use the established keyword for TCP.. but what can we do for UDP (short of replacing a ...
700 Software's user avatar
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BVI vs Bridge routers

What is the difference between BVI and Bridge on Cisco IOS routers?
700 Software's user avatar
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2 answers
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Cisco IOS ACL types

The built in command help list displays access list types based on which range. router1(config)#access-list ? <1-99> IP standard access list <100-199> IP ...
700 Software's user avatar
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Cisco IOS: access-list logging rate-limited or missed packets

How do we fix these errors? 2629753: Dec 29 09:03:56.521 EST: %SEC-6-IPACCESSLOGRL: access-list logging rate-limited or missed 2 packets This is a Cisco 871 router with BVI and access lists.
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Cisco IOS ACL: Don't permit incoming connections just because they are from port 80

I am going much based on my memory and I may not be correct on all of this. On a Cisco 851 (IOS) that uses a BVI or a bridge-route (the servers on the inside are configured with static and public IP ...
700 Software's user avatar
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3 answers
9k views

Why do Cisco IOS routers hang in the middle of large downloads?

After a few years in use. We have seen Cisco 871 and 851 routers that would hang if you had a single download that was more than 100M large. It is intermittent. Sometimes the problem goes away, ...
700 Software's user avatar
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Restrict NAT in IOS to only one public IP

I've managed to enable port-forwarding on my Cisco 877 but I wasn't able to find a way to specify a single accepted IP from the outside. Any link to a Cisco documentation or commands to type in IOS ...
Laurent Nominé's user avatar
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3 answers
2k views

Can't connect to PPTP server outside of network

I'm trying to configure my Cisco 881 running IOS 15 to allow pptp connections to servers outside of the network. I know the PPTP server is configured correctly, because a)it's a clients VPN, and b) ...
Dan McClain's user avatar
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Issue forwarding port through Cisco 881 router

I am ultimately trying to set up a PPTP VPN server inside my firewall, but to verify that the router will be configured correctly first, I am trying to pass SSH through the Cisco 881 to the SSH server ...
Dan McClain's user avatar
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IOS NAT with multiple interfaces

I am trying to create a DMZ type environment between two internal networks using Cisco NAT. The below configuration is working to permit the two 'nat outside' interfaces to access the dmz 'nat inside'...
Peter's user avatar
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3 votes
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Monitoring incoming/outgoing packets on a Cisco switch

I would like to monitor (i.e. have the switch print out packets) incoming and/or outgoing packets on a Cisco switchport. For instance, I'd like to be able to tell it: Print to the log all packets ...
MikeyB's user avatar
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Cisco IOS: One SSID doesn't pull from the correct DHCP pool

I have 2 SSID setup in my Cisco 881W router. Our internal ssid pulls from the right DHCP pool (wpool), while our guest SSID does not pull from the right pool (gpool) Here is the router config ! ! ...
Dan McClain's user avatar
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5 votes
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Cisco IOS: Segregating VLANS

I am trying to segregate the traffic on the VLANs, as one is our visitor VLAN (VLAN 3 is the guest lan). It is a Cisco 881W router. Here is my VLAN configuration: interface Vlan2 ip address 10.10....
Dan McClain's user avatar
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2 votes
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Example mrtg config to monitor Cisco CPU/memory usage

I have an existing basic MRTG setup done using cfgmaker to monitor the traffic of our Cisco router. I'd like to add configuration sections to mrtg to have it monitor the CPU usage (min/avg/max if ...
MikeyB's user avatar
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Cisco 871w security

I purchased a 871W ISR for a small business and want to know what's best use practice when setting up security for this type of router. At the present time I have a static IP assigned to it and can ...
hfranco's user avatar
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Cisco command wont work on syxtax checker

I'm trying to validate the building of a tool for managing Cisco ACL commands. Thing is i'm using the aclcheck sintax validator (i dont own cisco equipament) with the following command do check ...
jaderanderson's user avatar
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2 answers
9k views

Cisco IOS: NAT overload for two WAN interfaces

I have a feeling the answer is policy-routing, but I'd like someone to clarify that. Basically I'm not having any luck getting NAT to work with two WAN interfaces. I have two WAN interfaces: fe0/1 (...
WuckaChucka's user avatar
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2 answers
1k views

Syntax checker working crazy with cisco

I'm trying to verify only two commands for cisco IOS ACL Extendend. They are: access-list 101 deny any 192.168.0.0/23 any access-list 101 permit udp 192.168.1.1 any For this i`m using a ...
jaderanderson's user avatar
2 votes
2 answers
40k views

How to assign single port into multiple vlans

I have cisco switch 3560 and want to create vlans where in i can have a single port in multiple vlans. I tried creating one port e.g fa0/23 as trunk and then allowed it through multiple vlans but it ...
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1 vote
2 answers
1k views

Block Skype on Cisco IOS

I'm trying to block skype via policy routing but it's not working ... here's my configuration: class-map match-any block match protocol skype policy-map QoS-Priority-Input class block police ...
ensnare's user avatar
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7 votes
4 answers
2k views

Cisco IOS QoS prioritize SSH but not SCP

How can I prioritize ssh traffic to ensure low-latency but throttle SCP file transfers? I'm looking for a solution that is not host specific so I don't have to add lists of IP addresses. Thanks!
ensnare's user avatar
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Cisco IOS rewrite http url

Is there a way that I can configure my router to rewrite http requests? So for example, if: http://www.example.com/porn.gif is being accessed, it'll be re-written as: http://172.16.0.1/denied....
ensnare's user avatar
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1 vote
2 answers
1k views

Management VLAN Cisco Catalyst

I have configured a couple of VLANs on a Cisco Catalyst switch with IOS, i will put all the ports that clients is connected to, into these VLANs. I want to configure the native VLAN [vlan 1] as ...
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4 votes
2 answers
13k views

QoS for Cisco Router to Prioritize Voice and Interactive Traffic

I have a Cisco 891W NATing Voice and Data to the internet over a 10mbit/2mbit connection. Voice traffic gets degraded when I upload large files. Pings time out as well. I tried to configure a QoS ...
user avatar
1 vote
2 answers
6k views

RADIUS authentication on Cisco switches: how to assign privilege levels?

I need to configure some Cisco switches (IOS 12.x) to authenticate against a RADIUS server; the server is Windows Server 2003's IAS, and it validates users against his Active Directory domain. I know ...
Massimo's user avatar
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3 votes
2 answers
6k views

Can IOS be upgraded on a Cisco Catalyst 6509 switch without downtime?

There's this Cisco Catalyst 6509 switch with 2 (two) supervisor modules; one of them is active, the other is (almost always) in standby. We need to upgrade IOS; current version is 12.2.something (I ...
Massimo's user avatar
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2 votes
4 answers
2k views

Un-failing over a Cisco PIX 515e

We had a power outage at our data center last week and when our dual PIX 515E running IOS 7.0(8) (configured with a failover cable) came back, they were in a failed over state where the Secondary unit ...
Aaron Brown's user avatar
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1 vote
2 answers
4k views

Cisco Aironet (802.11n models): how to put a WEP128 ssid and a WPA/WPA2 ssid on the same radio?

I'm using a Cisco AIR-1252AG (IOS 12.4(10b)JDA3) and I must provide both a WEP128 wlan (for compatibility with older embedded devices, this will go to a firewalled vlan) and a WPA2 (WPA1 would be ok ...
Luke404's user avatar
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2 votes
2 answers
5k views

Simple road warrior IPv4 VPN configuration in Cisco IOS

I'm looking to setup a reasonably simple road warrior VPN configuration on our Cisco routers. Frustratingly, I've been searching for this but cannot find a simple complete guide. Multiple (not ...
MikeyB's user avatar
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2 votes
2 answers
3k views

Basic IPv6 firewall on Cisco IOS for small network

Now that I have IPv6 connectivity to my network, I'm looking for a basic IPv6 firewall configuration for IOS. It used to be that we could rely on NAT to 'hide' internal (read: outgoing connections ...
MikeyB's user avatar
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4 votes
2 answers
11k views

cisco router loses configuration on reload even after saving it

I'm configuring a Cisco 3640 and it's not saving simple things like my hostname. I've tried with 'wr' and 'copy running-config startup-config'. Also erased the configuration but no luck. There's no ...
Colin's user avatar
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1 vote
2 answers
911 views

Split horizon, route filtering, and having RIPv2 announce a non-attached route to host

Routers A, B & C live at 10.1.1.1, 10.1.1.2 and 10.1.1.3 on a /24 metro Ethernet subnet. Each router also has its own private subnet on another interface. Router B's private subnet links thru a ...
Paul's user avatar
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2 votes
2 answers
2k views

Cisco router and switch configuration

I want to configure a Cisco 2600 series router to be DHCP server. To the ethernet port i want to connect a Cisco Catalyst 2900XL 24 ports switch, in this switch i want to connect a computer in port X2,...
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2 votes
3 answers
3k views

Cisco ios config

I'm setting up a cisco 881 (this is my first ios device) I got everything working the way i want except port forwarding im trying forward all incoming port 80 traffic to 10.10.10.60 and I don't see ...
Crash893's user avatar
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5 votes
1 answer
617 views

Setting spanning tree link "priorities" in Cisco switches

I've got a pair of C2960G-48 switches (running IOS 12.2(46)SE, if it makes a difference) with redundant trunks in place. On these switches there are a bunch of VLANs that carry quite heavy traffic at ...
womble's user avatar
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0 votes
2 answers
547 views

output my Cisco 881 config

how does one "print" the startup config or running config. also what is the best way to import config you have stored as a text file?
Crash893's user avatar
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2 answers
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Setup Cisco IOS Static NAT

I'm trying to allow access to a printer on a separate LAN in the same building. I have control over only one of the networks... My attempt at not using another router failed see here. I now have a ...
Jon Rhoades's user avatar
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1 vote
1 answer
1k views

Configuration of Switch Module (WIC) on Cisco 3800

I have a 4 port module in my 3800 router, an HWIC-4ESW, that acts like a switch. I can configure IPs on each port if I do something like the following: conf t int F1/1 switchport access vlan 20 <...
Kyle Brandt's user avatar
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1 vote
4 answers
6k views

How do I find out what the WIC Model is from CISCO IOS?

How do I find out what the model number of a WIC is with an IOS command? In show interface all I get is 'Hardware is Fast Ethernet', I don't see anything under 'show hardware' either...
Kyle Brandt's user avatar
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2 votes
3 answers
924 views

*nix shell with IOS style completion?

Is there a Linux shell that will let you type less than full commands as you can with Cisco IOS, at least for the first command (and not its arguments)? I haven't really thought enough if this is ...
Kyle Brandt's user avatar
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2 votes
1 answer
10k views

Best way to view Cisco config file?

I just copied the config of our PIX 515 over to a TFTP server. I'm going to need to make some edits to this file before copying it down to a duplicate 515 device. Currently, I'm viewing the config on ...
Citizen Chin's user avatar
2 votes
2 answers
3k views

Using EIGRP to Advertise a VPN Tunnel Route

I have several routers all connected via a MPLS netowrk and one that is not. The one that is not part of the MPLS network is connected to one that is via a VPN tunnel. All the routers on the MPLS ...
Kyle Brandt's user avatar
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0 votes
1 answer
608 views

Cisco / IOS Priority of VPN Tunnels vs EIGRP Routes

If I have two interfaces, one which gets its networks from EIGRP, and another that is an internet connection with VPN tunnels. If the same network exists for match address of the VPN tunnels and an ...
Kyle Brandt's user avatar
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