Questions tagged [cisco-ios]

For discussion about Cisco's Internetwork Operating System - Cisco IOS

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17 views

SNMPv3 context on IOS-XE does not seem to work with Prime

We recently switched to SNMPV3 and experience the issue, that there is no client data available within prime anymore. So we quickly read about the SNMP context we need to add to our devices ...
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45 views

Routing failed after define static route on core switch

Current connection path: 10.40.20.0/24 desktop <-> access switch <-> core switch <-> 10.30.15.33 NAT firewall for internet access Objective: adding additional path as following to ...
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How can I auto-detect the default WAN gateway on a Cisco router?

I previously connected to my ISP using authenticated PPPoE and provided default routes for IPv4 and IPv6 as follows: ip route 0.0.0.0 0.0.0.0 Dialer0 ipv6 route ::/0 Dialer0 After switching to a ...
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NAT syntax comparison

Could I know if the NAT syntax on ASA5510 v9.1.7 should be the same on ASA5512 v9.9 or v9.12.3 ? Hope to get your answer. Many thanks
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81 views

Force Catalyst 2960X Boot Loader upgrade to the same version

I would like to know if there's a way to force a Boot Loader rewrite on Cisco Catalyst 2960-X switches. I got one model that runs this release of the Boot Loader: BOOTLDR: C2960X Boot Loader (C2960X-...
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51 views

Why we define pool for declaring CISCO router DHCP?

In case declaring DHCP server in CISCO routers, should define pool with network addresses.↓ Example Router(config)#ip dhcp pool net1 Router(dhcp-config)#network 192.168.1.0 255.255.255.0 The router ...
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41 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...
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23 views

What is the purpose of Cisco's `ip domain round-robin` feature?

While configuring one of Cisco's routers and reading documentation I've found an interesting feature: ip domain round-robin. Documentation says, that this options makes dns server rotate entries ...
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36 views

How to init connection with a Cisco over serial & minicom?

Trying to connect to a Cisco router, in purpose to learn Cisco skills that could help me finding a job. So, I plugged a cable in the rj45 Console (blue) port of a Cisco 888 router, and other end into ...
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29 views

Show ports in use on Catalyst 3570

I picked up a used C3570 and am new to IOS. I am trying to ask the switch to show which ports are in use. My searches lead to the command "show modules" but that's refused by the switch (...
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48 views

QoS Policy to not overutilize WAN link

I have a configuration on a Cisco C897VA-K9 router that has a built in DSL modem. It has a simple internet connection via VDSL. There is a VPN configured on the device, that connects back to our main ...
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18 views

Traffic flow of tunnel interfaces

I would like to understand traffic flow in a router. In what direction do i need to apply a policy-map in order to affect traffic? Especially regading tunnel interfaces, as traffic both comes and goes ...
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44 views

Cisco IOS NTP do not sync time after reboot

I try to setup automatic syncing time on Cisco Catalyst 2960-CG-8TC-L switch using following command. ntp server 0.cz.pool.ntp.org and it works and sync time but after switch reload it does not sync ...
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51 views

Understanding traffic flow on SVIs [closed]

I have a simliar question to this one: Access-Lists and VLAN and understanding traffic flow But my question is concerning service-policies. Have a look at the image above. I triet to make a traffic ...
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50 views

Cisco DHCP relay with Microsoft DHCP server

Current situation: we have a C3850 switch serving DHCP lease to desktop clients without communicating with any upstream DHCP server Objective: We would like the C3850 switch continue to serve DHCP ...
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38 views

IOS. Whats the difference between these 2 commands

I am completing an online course for the network+ and am going through one of the labs. Here is a diagram of the network in question. Specifically I have a switch with 24 fast ethernet ports and ...
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33 views

When do ACLs on SVIs get applied on Cisco Catalyst devices?

I don't understand exactly when an ACL will get applied when on an SVI. Given the following (pseudo) configuration int vlan 100 ip address 10.0.0.1 255.255.255.0 ip access-list in in ip access-...
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46 views

Upstream QoS garanteed bandwidth

In the network I'm trying to manage there is a satellite link, the upstream of which is ~ 7 Mbps. In this upstream, I need to allocate 1.5 Mbps of guaranteed bandwidth for one single host, but nothing ...
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109 views

How can I use an HTTP CRL on Cisco IOS?

On a Cisco 867 running IOS 15.6(3)M7, I'm trying to do the following: TEST-GW1(config)#crypto pki trustpoint vpn-p2s-server-11 TEST-GW1(ca-trustpoint)#crl query http://myvpn/crls/21.crl % URL must ...
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18 views

Is it possible to specify a bandwidth parameter per service instance?

I have a physical interface with multiple service instances and policer per service instance: interface GigabitEthernet0/3  switchport trunk allowed vlan none  switchport mode trunk  mtu 9192  ...
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18 views

Configue IOS DHCP server to respond to Option 60 class

I have a number of small networks each with about half-a-dozen mostly-fixed hosts. The routers on each network provide DHCP service for the occasional visiting engineer's laptop. I am adding IP ...
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16 views

Rate limiting xFTP traffic originating from a Cisco IOS router

We have some routers on marginal cell links that we need to pull files from using TFTP or FTP. During file transfers connections to the router become so slow as to be unusable. Is there a way to rate-...
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100 views

Cisco erase nvram or erase startup-config doesn't work

According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command. https://www.oreilly.com/...
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70 views

Cisco IOS Sanitization: Any Way to Not Use NVRAM?

We want a method to sanitize Cisco IOS 15 routers (ISR Gen 2) before they are removed from the facility. While a "write erase" works perfectly if the router is breathing, how to sanitize dead routers ...
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72 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
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206 views

Lubuntu 18.04 can't SSH to Cisco Router: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 [closed]

I'm not sure if this problem caused by Lubuntu or Cisco Router side. Lubuntu = 192.168.1.100 Cisco Router = 192.168.1.1 Ubuntu 18.04.4 LTS user@linux:~$ lsb_release -a No LSB modules are available. ...
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48 views

Firmware of Cisco Phone

i want to configure IP phone Cisco DX650 with Sip.Anyone have idea about it how i can upload firmware of sip feature
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18 views

Cisco IE2000 - NTP Doesn't Associate

I'm having a very weird issue with a switch. It doesn't want to associate to my NTP servers. My config is very simple: ntp server ntp1.domain.com ntp server ntp2.domain.com ntp server ntp3.domain....
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What's the difference between “IP NAT Inside Source” and “IP NAT Inside Destination” commands in Cisco routers? [duplicate]

As much as i know both of this commands translate source address of packets that travel from inside to outside and destination address of packets that travel from outside to inside,so what's the ...
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1answer
326 views

Link Aggregation from Cisco to Palo Alto using 10 gig interfaces, port on Cisco shows “waiting to be aggregated”

I am trying to bundle two 10-Gig interfaces on PA-3020 to Cisco Cat9300. Previously, I had bundled two Gigabit interfaces on same devices and everything worked fine. But now, when I try to configure ...
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1answer
33 views

Cisco snmp-server single user for multiple snmp versions

Attempting to maintain SNMP v2c compatibility while implementing SNMP v3 on cisco switch 5506cx. Would a user that was previously used for v2c see issues with v2c if it is added to a v3 group? For ...
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62 views

Prevent static NAT to respond to ARP requests

We are trying to merge 2 networks with overlapping IP spaces: This is the configuraiton so far: interface Tunnel1 description VPN Port CompanyA ip vrf forwarding LAN ip address 172.18.0.79 255.255....
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393 views

Cisco AIR-AP1852i-E-K9 stuck in “waiting for uplink[…]” after startup

I pulled an old cisco AP from a shelf today at work to test something, and after starting up and connecting with PUTTy, i was greeted with (after startup), this - repeating over and over: [*02/16/...
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29 views

Cisco PPTP server available routes protocol

I have a 2921 Cisco router in one place, and a Windows XP computer on another. I made my Cisco router as PPTP server, and my XP computer as a client. The router is located within a LAN with address ...
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43 views

Cisco C3750 and PRTG netfllow

I have a core switch (backbone) of our network that broadcasts all the vlans to other switches. I am trying to configure netflow on the switch and link it up to a Netflow sensor on PRTG. I followed ...
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130 views

What is the difference between trustpool and trustpoint on Cisco IOS?

On Cisco IOS, there is trustpool and there is trustpoint. I have seen imported certificates in either of the two. And it seems SSL connection works when either location has the certificate it needs. ...
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61 views

Cisco Switch without VLAN support?

I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN? So far, all switches that I found do support VLAN. This is one of the example in my lab. Cisco-Switch-...
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49 views

Cisco Guestshell - Bridging of VirtualPortGroup0

i'm fiddling around with ne virtual-services functions of IOS-XE. Is there a possibility to bring interface "VirtualPortGroup0" into a bridge domain with some physical interface of the router? It's ...
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45 views

Why doesn't kernel itself had entire L2/L3 protocol stack? [closed]

I know kernel itself handles protocols in layer 2, layer3 and layer 4 at ipv4 stack, but why can't kernel itself doesn't have protocols such as STP/RSTP/xSTP/OSPF...etc, implemented. Why should we ...
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99 views

TCP handshake immediately RST [closed]

I'm trying to set up a modbus TCP connection on port 502 but get a RST packet immediatly. So the TCP connection handshake doesn't even succeed. This is done on a windows machine on an ESX server. The ...
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1answer
51 views

Filter tagged route to downstream routers

I'd like to filter a redistributed route from EIGRP into OSPF to all routers in AREA2 and AREA34. I have tagged the route 10.90.100.0/24 with tag 90 at the Tampa router where its redistributed into ...
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1answer
65 views

Cisco Zone Based Firewall

I have Cisco 891F configured with ZBF from CBAC. Right now, router is wide-open SSH/443 or anything my public address is listening on, which is not what I intended. My intention was to only allow IMCP ...
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1answer
42 views

WebAuth With RADIUS For Switch Web Portal

I have a Cisco IE4000 running IOS 15.2. I am trying to login with my RADIUS credentials to the web portal for the switch. Currently the RADIUS is configured for successful login to Console and SSL but ...
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1answer
44 views

DHCP when you have both layer 3 and switch ports

I have the following config: ip dhcp pool Vlan10 network 192.168.1.0 255.255.255.0 default-router 192.168.1.1 interface GigabitEthernet0/0 ! interface GigabitEthernet0/0.10 encapsulation ...
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69 views

HTTPS QOS and policing [closed]

In our office, everything runs on HTTPS. We have softphones and web-based clients which are high priority. We also have Google search, maps and other low priority websites that should work on best-...
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58 views

cisco zone-based policy firewall

How to limit the number of established connections for each host, that connect to the service? In the policy settings, I found only blocking by the number of half open connections. parameter-map type ...
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2answers
235 views

Restricting TFTP access from Host to Router using extended ACL in Cisco IOS

I am trying the below Extended ACLs to restrict TFTP but still I am able to upload files to the router using tftp. Not sure, what is wrong, can you all help? Approach 1: permit udp host <ip> ...
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125 views

What does the Cisco HTTP client (help to) do on a switch?

While checking for vulnerabilities in one of our Cisco switches I came upon this: CVE-2019-12665. Excerpt from the CVE: A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software ...
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51 views

implementing broadcast traffic restriction

Can we restrict the high broadcast traffic from interface in Cisco ASR9k and 7600 routers? If so, what configuration we should apply?
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25 views

Cisco 7960 CTL File Encoding

When booting my 7960 phone, I am getting all of the correct files. However, in trust list (CTL File), the IP addresses are incorrect. They are the ASCII characters of the actual IP address. Therefore, ...

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