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.
309
questions
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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. ...
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1
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110
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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.
...
1
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1
answer
282
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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 ...
0
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1
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971
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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....
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4
answers
3k
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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 ...
1
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1
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112
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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 ...
0
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1
answer
584
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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 "...
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2
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6k
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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 ...
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1
answer
862
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BVI vs Bridge routers
What is the difference between BVI and Bridge on Cisco IOS routers?
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2
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469
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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 ...
2
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3
answers
19k
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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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425
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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 ...
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3
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9k
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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, ...
0
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1
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126
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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 ...
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3
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2k
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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) ...
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3
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4k
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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 ...
0
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1
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5k
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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'...
3
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1
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6k
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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 ...
0
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1
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2k
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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
!
! ...
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2
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1k
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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....
2
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2
answers
8k
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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 ...
0
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1
answer
58
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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 ...
0
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2
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149
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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
...
3
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2
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9k
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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 (...
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2
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1k
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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 ...
2
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2
answers
40k
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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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2
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1k
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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 ...
7
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4
answers
2k
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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!
1
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1
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720
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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....
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2
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1k
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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 ...
4
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2
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13k
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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 ...
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2
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6k
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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 ...
3
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2
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6k
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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 ...
2
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4
answers
2k
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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 ...
1
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2
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4k
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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 ...
2
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2
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5k
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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 ...
2
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2
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3k
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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 ...
4
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2
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11k
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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 ...
1
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2
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911
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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 ...
2
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2
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2k
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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,...
2
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3
answers
3k
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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 ...
5
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1
answer
617
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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 ...
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2
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547
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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?
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2
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3k
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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 ...
1
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1
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1k
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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
<...
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4
answers
6k
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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...
2
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3
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924
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*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 ...
2
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1
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10k
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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 ...
2
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2
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3k
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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 ...
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1
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608
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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 ...