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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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Many routers behind main router cause slow internet? [on hold]

I don't know if this is the correct place to ask, but here i go. We live with 10 people in 10 rooms in a 3 floor student house. Every room has an ethernet connection. When I do a speedtest I get an ...
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7 views

Archer C3200 not routing between LAN ports [on hold]

I am wondering if anyone has a solution for this issue. I am using a TP-LINK Archer C3200 WiFi router as an Access Point, like this: Internet-------wan:mainrouter:lan-------lan:Archer_C3200 ))))) (((...
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1answer
16 views

DHCP relay on Juniper MX

Hi I got a problem with bootp relay on a juniper router(s). I got helpers bootp interface configured with: irb.10 broadcast server 10.20.1.10 server 10.20.1.11 theres several irb ...
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1answer
18 views

Is the Backbone Area connected AS Area are through one router?

I am studying Networking, and I find the Area 0.0.0.1, Area 0.0.0.2 connect to the Backbone Area is through one path, is it means only through one router(or say not more)? we often hear that the ...
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24 views

Which routers can monitor network traffic? [closed]

I have an Apple Time Capsule router. It is not able to monitor or analyze network traffic. I have many devices connecting to the router and need some way to know where any large amounts of data ...
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1answer
43 views

What does 'parent interface' mean with respect to VLANs?

I'm trying to learn about VLANs by configuring a router with PFsense installed. Reading the documentation I came across the following sentence: The following example shows how to configure two ...
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2answers
43 views

Old 2611 and desired features

I just recently got my CCNA and bought some routers from the teacher that he had laying around to do some home labbing. While two of them are good and more modern, the third one is an old 2611 from ...
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1answer
104 views

Data link layer acknowledgement

I'm confused with some concepts please help me out, Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does ...
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1answer
36 views

Pros and Cons of two different ISP connection Model

I have seen two different models to connect My Server to cloud. Model 1: DNS ------| |---ISP_Router---Cloud----DSL Modem---Office_Router---Switch---My_Own_Web_Server Google ------| ...
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1answer
37 views

How does a device differentiate between a router interface and switch interface

We have a device in work, in the manual it says connect via a switch. Obviously it works fine with any other device, once it is connected via a switch. But say in a topology, it could be directly ...
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1answer
40 views

what is the point of making directories in a cisco cli

what is the point of making directories in a Cisco router. I noticed its was kinda like Linux mkdir and all that stuff, but what is the purpose?
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1answer
61 views

What hardware do I need to assign IPs based on port?

Similar (but different) question: Assign an IP address based on switch port I regularly need to test our hardware products. Usually that consists of having ~50 devices sitting on a bench for some ...
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21 views

How to implementing QoS on cisco devices? [duplicate]

I have to make some QoS configuration for my school project. My main goal is to prioritise video and vocie traffic. I looked after some configuration example but didnt find out how it really works. I ...
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32 views

Make a tunnel from small business router to Amazon VPC

I have a Cisco router for small businesses, model RV320 and would like to connect it to Amazon Virtual Private Cloud via IPSec tunnel. My current state is that both the router and AWS say that they ...
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2answers
67 views

Why can't I get a WiFi password by sending out the same SSID?

If I have two WiFi routers in different locations but with the same SSIDs and I connect a device to one of them, when I bring this device near the location of the other router, it will automatically ...
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1answer
48 views

Assign DHCP IP address on Cisco router interface

Hi, dhcp router is configured with following DHCP settings: ip dhcp pool B network 192.168.1.0 255.255.255.0 default-router 192.168.1.1 ip dhcp pool C network 192.168.2.0 255.255.255.0 default-...
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1answer
17 views

4G connection PLC [closed]

I'm trying to control online a Siemens' PLC. 1200 series. I'm using a router 4G (TP-LINK) with a SIM card. I created a DynDNS in the router with NOIP.com but I can't communicate with it. The ports ...
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1answer
38 views

how to deny ping from one direction but not the other using Access-list

Hello everyone. What I'm trying to do is to deny ping access from the 12.12.12.0 network to reach the 10.10.10.0 network but not deny ping access to go from 10.10.10.0 network and reach the 12.12.12....
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3answers
668 views

Do routers change MAC address of packets when forwarding

Lets say host A wants to send a packet to host B through R1(interface 1 then 2) and R2 (interface 3), so my questions is: When the packet is forwarded inside R1 (from interface 1 to interface 2), ...
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1answer
35 views

Does segment routing protocol steer packets based on best (longest) prefix matching?

In segment routing protocol, we know that the routing process is source steered. I'm struck to know if any best (longest) prefix matching happens to route the data packets? If so any clue about the ...
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3answers
1k views

How not to route on a Cisco router

So we have a router, with a switch card interface, 8 ports Say I have 4 VLANs (A,B,C,D) on it, with 2 switch ports in each. Each VLAN (i.e. all ports) can communicate with each other, because ...
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25 views

Can't save configration in router(gns3 )

I have installed gns3 v2.1.9 with gns3 vm(oracle v5.2.18) in my Ubuntu 64bit v18.04. I have installed 2 routers 3725 and 3745 in gns3 vm. But if i try to save my config with copy running-...
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1answer
54 views

How to solve a BKN* Port Issue on a cisco catalyst

There is a Cisco ISR 4451 connected with Portchannel to a Catalyst 3850 Stack and there are some VLANs enabled, but only one does not come up for a Portinconsistence. I figure out an Issue on the ...
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1answer
34 views

Whether the network between Routers are circuit-switched network, and the network connected by Switches are packet-switched network?

Whether the network between Routers are circuit-switched network? and the network connected by Switches are packet-switched network? EDIT-01 I mean if the Net1 can be regarded as circuit-switched ...
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2answers
33 views

Cisco router with switch interfaces help

I was wondering if a connection comes in on a Cisco router interface. Can that connection be pointed towards a switch interface if said router has a switching module? I haven't tried it, but I'm ...
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2answers
65 views

How to understand “in a router, this number can reach hundreds of thousands”?

When I reading a document: The number of routing entries in a routing table may be just a few in a typical host, and in a router, this number can reach hundreds of thousands. How to understand the ...
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2answers
51 views

How to understand the default gateway generally refers to the 0.0.0.0/0 route?

I am reading a document: The default gateway generally refers to the 0.0.0.0/0 route, which is used when there is no clear routing entry to a destination address. How to understand this sentence?
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1answer
22 views

How to use a remote shell on a machine outside of network

I understand the differences between LAN and WAN addresses. My question is: while outside a network, how do you target a specific machine's address beneath a public IP? Since a public IP for each ...
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1answer
36 views

What are the differences between a basic configuration and a full configuration of a network device?

When someone is talking about a basic/base configuration of a network device, does this mean the startup configuration file? And when a full configuration is referenced how is it different from a ...
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1answer
40 views

Cisco RV325 VPN to Remote Site with Multiple VLANs

We've been running a VPN over two Cisco RV325's successfully using the following mapping: Site1: IPS="NAME=g2gips0&WEBNAME=Site2&LSUBNET=10.10.0.0&LMASK=255.255.255.0&RG_IP=71.XXX.XXX....
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1answer
52 views

Why don't most routers automatically update their firmware? [closed]

Recently I realised that my new router's firmware was outdated. Searching a bit, I found out that most routers need to be manually updated to a new version of firmware. Running an old firmware could ...
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1answer
52 views

R2 and R3 cannot ping each other

below is a capture of the configuration. R1 can ping the other two routers but R2 and R3 can't ping each other. Any idea what my issue could be? Screen Shot 2018-09-03 at 2.57.00 PM.png Router2#sh ...
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13 views

Device, how does it receive from wifi extender and router

I was wondering how it works if your device would be between the router and the wifi extender, wich one it would process, and how it knows wich one to process. Thanks in advance everyone!!!
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1answer
65 views

Can all ports on nowadays switches act as uplink ports? [closed]

I basically know nothing about networks (I just learned what switch meant yesterday), and English is not my first language but I hope I can make my question clear. So I just moved into a new house, ...
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1answer
28 views

Strange ip address in the log entry on my router [closed]

I have an TP-Link N750/WDR4300 wireless router. I look into my logs to day an found a couple of entries that looked like this: Aug 30 06:19:29 DHCP INFO DHCPC Send REQUEST to server ...
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1answer
38 views

Giving a device a hostname [closed]

When I connect a device to my router, or if I use a tool like Advanced IP Scanner to look for devices on my network, the found devices are typically listed with and IP and a hostname. On Windows the ...
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2answers
338 views

Router filter broadcast frame?

Hi I'm a newbie in Networking, still confused about some basic concepts. If given a picture below: My questions is: Let's say node C wants to send a datagram to node A but node C doesn't know node A'...
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0answers
8 views

Using Router instead of switch to isolate traffic [duplicate]

I was reading my textbook which says that : Although the hierarchy localizes group traffic to within a single switch, broadcast traffic (e.g., frames carrying ARP and DHCP messages or frames whose ...
0
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1answer
45 views

Some users/routers often can't access the internet [closed]

There are times that some users can't access the internet. Usually this happens with the routers with DHCP enabled, they alternately can't access internet. I suspect that the main router is faulty. I ...
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2answers
85 views

Prevent OSPF routes advertised by other routers from entering the routing table?

I have a fairly complicated scenario that I've managed to duplicate with GNS3. Please see the attached image. In this scenario I have four "Branch Offices" each with their own router connected to ...
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1answer
27 views

Prevent OSPF routes from one network from being redistributed to the rest of the network?

Synopsis: Network A needs to be able to use a static default route to Network B via a local connection (G0/0/3). Network A does NOT want to route ANY Network B addresses through the rest of its ...
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1answer
29 views

Network interface issues an ARP request to get the MAC address of an actively used gateway

My network interface actively uses a gateway to send IP packets to other networks. There is already an ARP entry in the cache for the IP/MAC association for the gateway. Is it normal that my network ...
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1answer
30 views

Create Accounting for Internet and merge ADSL, is there any way? [closed]

I have 4 Simple Wireless ADSL Modem that 4MB, 8MB, 16MB, 40MB Internet BW. I have one HP Server with 4 Network Ethernet Ports. I have 7 LAN based PC's, 2 Network Printer and some wireless station ...
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0answers
22 views

Setting up a GPS TCP server [closed]

I am working on a project where we are using a GSM modem with built in GPS system. The modem has setting to send GPS signal NMEA format to a remote TCP server. Can someone consult on where should i ...
0
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1answer
29 views

Change firewall rules of a Cisco Router from network

I'm looking for ways, methods or workarounds to: Change firewall rules (WAN/LAN accept-deny) of a Router from networking, through Linux command or PHP script, can be a socket, or rest service, soap ...
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2answers
37 views

Cannot reach 4th hop, pc as router, static routing

I'm trying to set a PC as a Router and somehow it's not working correctly. I have following setting: CLIENT A 192.168.21.1/28 l l 192.168.21.5/28 ROUTER X 192.168.21.25/28 l l 192.168.21.17/28 CLIENT ...
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28 views

Port 50000 UDP not passing traffic in cisco 1921/K9

I have two devices that use UDP on Port 50000 these are on vlan 103 they are IP's .222 and .223 trunked to an HP switch I have tried several ACL's but no luck, router config is as follows, Building ...
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3answers
171 views

How do I Connect 4 Router with 1 Switches?

Few days ago, I got an challenge from my Senior at my workplace. Here's the representation of the topology that he gave to me : The question is, how I make each pc could ping each other? I tried IGRP ...
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2answers
48 views

Why router interface need IP addresses while IP is constant during the journey?

A beginner question, I've recently read in Cisco CCNA R&S 200-125 official cert guide that the packet leaves the PC with a destination IP of PC2 (the target) but with the MAC of PC2 in case of PC2 ...
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1answer
35 views

Subinterfaces at Cisco routers

What is behavior of subinterface on cisco router that has configured #encapsulation dot1q vlan_id but has no IP address configured? Will it work as L2 interface? Or will not work at all?