Questions tagged [cisco]

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52 views

ssh from cisco with fake source-ip

I have two cisco devices directly connected. router1 = 10.70.223.96/31 router2 = 10.70.223.97/31 on router2 there is an admin ACL permit 10.64.95.0 0.0.0.255 so I can't only SSH router2 from that ...
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33 views

BGP Authentication Key-Chain Between Cisco IOS XE L3 Switch (c9300-24S) and Juniper MX480 Router

Need to create a BGP authentication keychain between Cisco and Juniper devices. Need assistance with config commands for Cisco 9300-24S.
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56 views

Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...
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97 views

Access list command for specific IP range in Cisco Router 1921

For example: router(config)#ip access-list extended 101 router(config-ext-nacl)#10 per icmp any host 192.168.1.10 From second command line, how to write a command permit icmp any host range 192.168.1....
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1answer
54 views

VLAN Filtering not working

On Cisco devices I'm looking to enable some filtering for one specific vlan (id 110). Here is my config : (192.33.57.177 is the DHCP server host) ip access-list extended VLAN110-DHCP permit ip any ...
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21 views

Cisco CML 2.0 strange ASA trunking issue

I am seeing very strange issue and now i am losing my mind so thought ask you folk. I have following two components connected point to point on Cisco CML 2.0 [nxos-9000v]--------------------[ASAv] ...
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1answer
24 views

BPDU Header System ID Extension

Previously network switches was using the 8 byte field Bridge Priority to identify a root on the network.When networks grows and becomes complex vlan creation comes into play the 2 bytes Bridge ...
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28 views

why SLA Track 8 isn't applicable to my ISR Router

On a Cisco ISR 4451 I configure SLA Function as follow: track 8 ip sla 1 reachability ip sla 1 icmp-echo 10.1.1.81 source-ip 10.1.1.80 ip sla schedule 1 life forever start-time now And then I want ...
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36 views

Flapping MAC address issue on the uplink routed port

The scenario is like, in my VLAN 30 network, randomly one device stops communicating and when I check the Cisco L3 Stack switch, it shows the following error messages: Jul 27 13:59:55: %SW_MATM-4-...
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17 views

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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1answer
82 views

OSPF route advertising same subnet in same area 0?

Now: SW02 currently running OSPF area 0 with redistribute connected subnets which includes VLAN10 with another router/switches which isn't in the picture and not in the scope of this question; VLAN10 ...
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1answer
138 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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1answer
67 views

PAT with multiple VLAN

I've set up a network with 4 VLAN, 3 VLAN configured PAT on it and 1 VLAN configured STATIC NAT. The router is acting as the DHCP server. Outside of my router I have another router acting as "the ...
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28 views

routing a network with 2 interfaces and vpns [closed]

I'm pretty inexperienced in network but here is the idea of what i want to do: I have 2 interfaces: Interface #1 = fast internet Interface #2 = stable internet with static ip address this is the ...
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62 views

Access printer in VLAN1 from VLAN2

I have a network printer (Brother MFC-L8690CDW) connected to Cisco RV340W (with latest firmware) on VLAN1. I have installed driver and it works as usual no issues there. Now we have created VLAN2. My ...
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1answer
62 views

BFD issue with BGP support on Cisco 9396PX

I have following BGP configuration and trying to reduce my convergence time with help of BFD but having hard time. router bgp 1111 log-neighbor-changes address-family ipv4 unicast network 22....
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3answers
184 views

Cisco SG-350 Switch and Fortigate Firewall Configuration

I'm not what you would call a Network Engineer, but right now i have a (somewhat) complex network problem that i have to solve. I must configure a SG-35028p cisco switch and a fortigate 60f firewall ...
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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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2answers
77 views

EIGRP advertising of routes for other networks behind us

Continuing my expedition in to trying to learn EIGRP and other routing techniques in GNS3, I now have another theoretical network, depicted below: Everything in the red area is a mystery. We do not ...
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33 views

Distance Command in OSPFv3

Does anyone know if there is a way to specify the distance of a specific neighbor in OSPFv3 in a Cisco router/switch? You seem to be able to do it for an entire area, but not for a specific neighbor ...
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1answer
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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1answer
26 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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2answers
214 views

Recommended switches and routers configurations for a building of 5 floors?

Just recently I had an interview for a network Engineer position. The interviewer asked me the following: You have a building of 5 floors, where each floor has around 30 employees. What is your way of ...
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1answer
37 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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2answers
42 views

How to access Cisco 2500 series admin GUI interface with known IP address when Firefox/Chrome state connection cannot be reached?

I know the username and password of my Cisco 2500 series wireless & ethernet controller and its IP address, but when I enter the IP address into a web browser (Firefox and Chrome) it states the ...
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1answer
39 views

Unicast and Multicast MAC address convention

I need help in understanding how Unicast and Multicast MAC address is differentiated as explained in wiki. According to what I understood, when the least significant bit is set as 0 in the first octet ...
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1answer
18 views

Blocking 2 VLANs from accessing a specific VLAN on a network

I'm working on a project in packet tracer and I have a server connected to VLAN 10. VLAN 10 has a single server device on it and the IP scope is a /30. I have 8 other VLANs across 2 sites. The 2 ...
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2answers
50 views

Unable to ping but I can see the arp in switch 4451

Recently I got to know that I am unable to ping the IP addresses behind vlan236 from core1 whereas I am able to ping the same from core2 and able to ping the IP address of vlan236 from my laptop as ...
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1answer
62 views

Trunking multiple VLANs into a single trunk port on a 3650 Switch

Morning: I'm new to the world of Cisco Packet tracer, and I am creating a network for a uni project. So far, what I have is: 5 VLANs (subnetted to 192.168.2.0/26, 192.168.3.0/36 etc) All are ...
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1answer
57 views

Port Channel issue on Cisco gear

I have a lab where I'm connecting a Cisco CSR1000V and a Nexus 9000 switch. These devices are connected back to back. Relevant configuration is: Router: interface Port-channel1 mtu 9216 ! interface ...
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0answers
8 views

Computer getting Unable to Identify Network UNLESS Vlan is changed [closed]

This is a problem that has long plagued this environment. At seemingly random times (measured generally in months), a computer may suddenly lose connectivity to the network. It still is able to send ...
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2answers
70 views

EIGRP route redundancy in a ring topology

Within GNS3, I am attempting to configure five Cisco 3660 routers in a ring topology with EIGRP, as an early exercise to try and learn how to use EIGRP: These routers and virtual PCs are configured ...
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2answers
31 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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2answers
108 views

EVPN/VxLAN border-leaf question

I have couple of question in above design where i have typical clos network design and my leafs are configured for Cisco vPC for redendency and anycast gateway and running OSPF for underlay and BGP ...
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1answer
28 views

Cisco ASA: What is the best way to restrict access of nodes in the same network to each other? [closed]

There is a network with five nodes on one interface. These nodes should not be accessible to each other. An option is to use an ACL, but is there another way?
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2answers
95 views

OSPF routes through L3 Etherchannels

I have been working on the setup below and basically I can't have OSPF populate the Routing tables of the L3 switches. I have properly set up L3 Etherchannels between them with the proper addressing. ...
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1answer
47 views

PortFast For Some Networks But Not Others

I have 4 offline self contained networks. They are setup as such: Network 1: Windows Server 2016 As Domain Controllers And Windows 10 (1909) Clients Connected by Cisco C9300-24Ps. Network 2: Windows ...
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2answers
133 views

How to add multiple computers in cisco packet tracer?

Hey, I'm the newbie of Cisco Packet Tracer. In the image as you can see there are lots of computers(0-99,1-200). I couldn't do that. Is it possible or it just some way of describing how much computers ...
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10 views

Assign to each of the devices(computers, routers etc) an IP address using as default Network IP address: 192.168.4.0 /24 (Use VLSM for subnetting) [duplicate]

when my professor gives me Homeworks I had the number of hosts(so then I can do the necessary calculations to find the IP addresses)but in this project, I have to find it by this given IP address: ...
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1answer
142 views

Two Datacenter location with same BGP AS number

Currently we have DC-1 running eBGP with my ISP using AS:1111 and i have prefix 1.1.1.0/24 and using BGP Default route because we have only single ISP. Now we are opening new Datacenter in remote ...
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1answer
53 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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1answer
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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1answer
35 views

Can Cisco Config cause Unidentified Network

I have a Cisco C9300-24P layer 2 switch with a dozen computers and 2 servers on the same VLAN, all statically set with no default gateway as there is no router and all offline from the internet. The ...
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1answer
167 views

Is there a Gigabit switch in packet tracer (more than two gigabit ports)?

I am trying to configure a packet tracer based on a scenario. I am wondering if there is a way to get a GigabitEthernet 0/5 and a GigabitEthernet 0/6 interface on any of the switches? I have tried ...
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2answers
64 views

IPV6 static Routing

I'm new to networking and I'm currently learning about IPv6 in static routing. I set up an environment in Cisco Packet Tracer like this: have connected two routers with serial medium , each router ...
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3answers
102 views

Have we failed a wireless survey for something that couldnt have been offered?

On a large campus wireless network (approx. 500 APs, 4-5000 connected devices) we have been asked to create an SSID for some specific equipment that can only work on the 2.4Ghz range. No problems with ...
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3answers
89 views

Can link aggregation be substitute for stp protocol?

Can link aggregation be a substitute for STP protocol? I mean can I use 2 links with Link Aggregation to connect two switches for higher availability as an alternative to STP protocol?
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2answers
84 views

BGP influence outbound traffic based on prefix

I have two router core1 and core2 connected with ISP router border1 and border2 using eBGP peer and i have 5 public subnect (/24). My ISP sending me default route instead of full BGP table. Question:...
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3answers
73 views

Static NAT and PAT

I have two private IP addresses, want to make them NAT to 203.0.113.0/2 public IP address. WAY 1 : Static NAT (2 ip addresses NATted to one by manually) WAY 2 : PAT (Router gives port number ...
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0answers
70 views

vPC + HSRP load-balancing issue on Cisco CML 2.0 lab

I am playing with new cisco cml 2.0 lab simulator and seeing strange behavior not sure if its real issue or limitation of cisco lab. dist1 and dist2 is my vPC (NSOX 9000v) peers, and tor1 is IOSv ...

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