Questions tagged [router]

For questions about network routers, devices that forward data packets between computer networks, commonly at the network layer (layer 3) of the OSI model.

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14 views

Ping and DNS is working but internet is not working [closed]

Non-CS guy here, I'm just curious how can this be possible. I'm able to ping any website and DNS lookup is also working fine. That means I can make a connection and internet should work, but it doesn'...
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1answer
24 views

Do all devices which use Wi-Fi (802.11) use CSMA/CA?

I know this is quite trivial, but I just want to know if all devices which support Wi-Fi through interface cards/hardware (like laptops/PCs/phones..etc) use CSMA/CA irrespective of their router/...
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Exend network with a router as AP or with dhcp disabled [closed]

I have a modem/router on 1st floor from the provider and I want to extend my network on 2nd floor. I have ethernet cable from 1st floor to 2nd floor. What is the best way to do it? I have a router ...
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1answer
28 views

Routing Protocols and sharing information

I am running multiple Protocols on different Routers as so: R1-RIPv2 EIGRP OSPF R2-OSPF and RIPv2 R3-RIPv2 and EIGRP R4-EIGRP and OSPF This is not a practical exercise, it is just to explore how ...
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3answers
6k views

How does a router learn about networks that can be reached from its interfaces?

I was studying, and I got stuck in trying to find out the best way to answer this question: explain how a router learns about networks that can be reached from its interfaces and how it routes ...
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5answers
377 views

Is a “LAN” a layer 2 or a layer 3 concept, in TCP/IP?

I think my question is purely theoretical and a matter of definitions; it derives from the fact that a L2-switch with VLAN capabilities is able to "create" different virtual LANs, and thus I am led to ...
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1answer
20 views

Routers FastEthernet interface clock autonegotiation protocol

In routers, for serial interfaces, we need to manually set the clock at the DCE router so that the ends of the connection can communicate. I know that in this way we are using time-division ...
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14 views

How to block one router from accessing network [closed]

Situation I have a network with two routers. Router A distributes internet to router B. Router A IP range 192.168.10.1 -254 Router B IP range 192.168.1.1 -254 Goal Router A should give router B access ...
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2answers
35 views

Using WAN IP for a host instead

I have a single static public IPv4 address from my ISP. So I understand that i can just forward all traffic using port forwarding to one of my private IPs, but still I am wondering if this is the ...
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6answers
71k views

Difference between control plane, data plane and management plane?

I think I understand these concepts, but I'm a little rusty. Can someone give a concise, easy-to-understand explanation of these concepts? The planes are logical concepts, aren't they? Is this a Cisco ...
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Equivalent a host file in the company's network to create a exception domain [closed]

My company's has a network and a server inside it. I want to create a exception like in host file: 192.168.254.3 subdomain.aaaaaa.com inside the company's network because we have more than one ...
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Using homeplug and an old router to setup extra wifi [closed]

I have a plusnet router and a great service from them. Because I have a old/large house the wifi from the router does not get to every room.I also have many homeplugs and use them to connect PCs to ...
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1answer
34 views

allow 2 machines to communciate each with their own network? [closed]

2 networks. Network 1 local and i want to be able to receive and send information to network 2 which is at a remote site, branch site. How do i go about connecting both networks so that both machines ...
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2answers
67 views

What device manages VLANs?

I understand what a VLAN is and what purpose it serves. However, I'm having a difficult time understanding where VLANs orginate. Specifically, I know CISCO firewalls, switches, and routers all deal ...
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1answer
40 views

Suspect MTR showing incorrect packet loss through router; other tools are not showing loss

Using MTR (sending TCP with or without SYN), I'm consistently seeing packet loss on one intermediate router in the path. UDP does the same. I'm use TCP to avoid the ICMP packet flood limits set. I ...
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2answers
48 views

Cisco Router on a Stick IP Addressing

I have been running into IP addressing problems with my Packet Tracer network and VLAN assingments. I have 2 switches connected to a router, 1 switch has 4 VLAN's and the other has 3 VLAN's I can't ...
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3answers
299 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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6answers
14k views

Best practice - Set static IP in device or router?

Pretty simple question. What is the industry best practice? In a small business which has computers which require static IP addresses is it better to set static IP addresses for devices on the ...
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1answer
37 views

Can a device with static native IP communicate with another device getting IP from DHCP

I have a device with a native IP : 192.168.0.1 - 255.255.255.0 I would like to know if it is possible for my computer to join this network using my router set to give ip address from 192.168.0.2 to ...
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2answers
576 views

Slow performance with Cisco Comcast Business router with static IP address

20I have a server with a static IP address connected to a Comcast Business router (Cisco DPC3941B). I also have a second machine directly connected to the same router. It gets assigned a NAT address ...
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1answer
7k views

Assigning IP addresses to FastEthernet

I've just started my Cisco Router 886VA with factory settings. I am willing to assign port FastEthernet 0 to an IP address. This port is connected to my laptop which acts as a NAT between the router ...
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1answer
123 views

Cisco ASA and a Router?

I'm trying to understand networking and when looking at the different routers, firewalls and switches, I came across Cisco ASA which many use for firewall and routing abilities, so if you use an ASA ...
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2answers
84 views

How does a router decide what route to forward a packet when routes come from different routing protocols?

I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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2answers
95 views

Working in packet tracer, can I configure two routing protocols

I am working on network lab designing topology. I am able to configured two routing protocols which surprised me. I configured RIP and OSPF routing protocols in layer3 switch and advertised same ...
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1answer
84 views

Can't log in after admin password change

I reset my admin password with below command: #Set system login user admin authentication encrypted-password <new password> But now i can't login to my device, what can be the reason?
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3answers
19k views

Difference between router and gateway

What is the exact difference between router and gateway? In Network configuration we set the default gateway IP address, but in reality we call the device configured with that IP address as router?
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2answers
45 views

Why is in all arp table snmp oids an interface index before the ip number?

When I want to get arp information about a single ip number or subnet, I have to snmpwalk the whole arp table, as some oid architects had the "great" idea to always insert an interface index ...
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1answer
35 views

How can i set up a Wireless LAN to serve 20,000 concurrent devices [closed]

How can i setup a wireless LAN that can serve up to 20,000 concurrent devices. I am having a problem in figuring out if i need one router or several routers. A topology diagram with explanation would ...
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3answers
97 views

Ethernet to fiber converter

If you have a router which only allows Ethernet ports, can you use a converter to convert to fiber? For example if I have a switch that is capable of fiber, would I be able to link this to the router ...
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1answer
93 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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2answers
40 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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8answers
9k views

How to connect 5 different networks together?

I have a network consisting of three servers in a data center, all of which are connected to each other via a switch. In addition to this I need this network to access 4 additional networks, most of ...
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2answers
57 views

I cannot Encapsulate on Router

I have VLAN10 and VLAN20, I am trying to communicate between computers with the same VLAN on the following setup: I want to apply encapsulation from Router but it doesn't seem to recognize ...
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2answers
40 views

Connect switch to router

I have a switch with 4x 10Gb SFP+ ports. Can I use one of the SFP+ ports to connect to a router with a fiber cable?
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4answers
758 views

How does a router know the destination mac?

so if I send a packet from a host to another from the same network we know the mac address of both the source and destination. However if the receiver is in a remote network the destination mac ...
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1answer
43 views

Some mobile clients are unable to connect to UniFi AP mysteriously

We have two UniFi Controllers, one contains the main internet its directly connected to the fibre and then we give internet to the second controller using LAN connection, internet works fine in main ...
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2answers
288 views

What happens if we try to access an IP Address that does no exist

Beginner Question: I just read an article talking about how the internet works and how routers make sure that packets arrive at the destination. However there is one thing that is not explained ...
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1answer
169 views

Where exactly is the limited broadcast address used?

I read that limited broadcast address will be dropped by the router. So, it's not used in the layer-3 (Network layer), where IP addresses are meant to be used. So, where exactly is it used?
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2answers
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
55 views

can't send packets if the link is currently busy?

I'm new to networking sorry if my question sounds dumb, I was reading a textbook which says: the outbound link for the packet is the one that leads to router B. A packet can be transmitted on a link ...
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2answers
40 views

juniper router /var directory is full , deleting .tgz file in root directory

i need to free some space on my juniper router , in the root directory when i use >ls -lash command i see a .tgz file which is 405 M , my question , if i delete this will it cause any problem ?
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4answers
22k views

Using IP addresses from IP pool given by ISP

My ISP says that it can provide an optic fiber connection with a pool of 4 static IP addresses (subnet 255.255.255.248 i think). My question is that if I get that connection, 1 ip will be used for ...
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7answers
632 views

Can the same network IPs be used more than once

Because of how routers separate networks is it possible to say use the network 192.168.1.0/24 several times as long as you have enough networks to separate? Example: 192.168.1.0/24 <--> 172.16.0....
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2answers
44 views

Layer 2 managed switch and layer 3 switch

If you have layer 2 managed switches which have VLAN's on them, do you still need a layer 3 switch/router?
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3answers
61 views

Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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2answers
41 views

Is the outgoing interface of a router in the same Subnet as the Incoming interface of the NEXT HOP router?

In the TCP/IP Volume 1, it is stated that ARP works only on the same subnet. Does this mean that the outgoing interface of a router is necessarily on the same subnet as the incoming interface of the ...
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3answers
321 views

Why ip nat {in,out}side?

Although I understand how NAT is configured on Cisco, a broader question came up about the why behind it. When configuring e.g. NAT overload, you specify a few items: An access list ... ip access-...
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2answers
77 views

Are all packets addressed with the MAC address of the router as they leave the machine?

In the Comptia Network+ All in One, it is said that most home routers have a switch built into them. It is also said that the first thing the router does is strip off any layer two information present ...
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2answers
84 views

I still can't understand how routers work

I've seen a topology that has 1 router for each network, for example: Network1: 192.168.1.0 192.168.1.2/24 PC1 -> 192.168.1.3/24 PC2 -> 192.168.1.5/24 SWITCH -> 192.168.1.1/24 ROUTER 192.168....
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3answers
57 views

How to communicate Different VLANs in Different Switches

I have 3 switches, 2 switches connected to 1 main switch. I have VLAN6, VLAN7, VLAN8 and VLAN9. VLAN6 has VLAN6-1 end device. VLAN7 has VLAN7-1 end device. VLAN8 has VLAN8-1 and VLAN8-2 end devices. ...

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