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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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46 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
49 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
68 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
246 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
34 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
41 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
171 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
61 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
70 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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1answer
457 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
61 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
47 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
412 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 ...
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1answer
75 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
781 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
134 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
97 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
33 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
30 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 ...
1
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1answer
50 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
40 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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3answers
341 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
62 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
38 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?
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1answer
41 views

Can cisco router interfaces be configured to be L2 interfaces?

Can cisco router interfaces be configured to be L2 interfaces? Like #no switchport command turns L2 port to L3 port at cisco switches?
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3answers
63 views

How are the bits of packets not mixed together in queues in store and forward routers?

From what I understand, store and forward works on the principle of storing bits of packets until the whole packet is received and then transmitting them. Also, bits are made to wait in a queue before ...
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0answers
43 views

traffic of AF41 marking under interface

I have used port-queue commands most of the time to check traffic status under BE, EF, AF4. But I haven't found command to check for AF41 to AF42 on Huawei VRP or cisco IOS. How can check traffic of ...
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1answer
39 views

Help with this acl

This is what i am trying to do Deny the network that host 200.200.200.10 is on, telnet access to R3 Permit host 200.200.200.10 to telnet to R3 Deny host 200.200.200.10 all access to host 204.10 on ...
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3answers
191 views

How do routers intercept packets?

I'm trying to learn about iptables and port forwarding and I'm running into a very simple hurdle. If my understanding is correct, this concept applies when there is a local area network, a router, and ...
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0answers
35 views

Internet not working [closed]

I have this types of network in my office. Recently we have moved to new i BSNL internet. My problem is when i bypass router and connect poe cable to computer internet is working but when i put ...
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1answer
331 views

Monitor VyOS Router

I'm actually using VyOS 1.1.8 an i wan't to collect the eth0 interface traffic to send it to a centralized syslog server. The thing is that i want to have the net traffic in some format like squid ...
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2answers
845 views

routing between vlans not working

I need to put a Cisco router behind an ISP router. (The ISP doesn't allow us to use their modem only.) I've called the ISP technical service and they've set up the connection with me. Their router ...
4
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1answer
881 views

Do we send ack frames in ethernet? if not then how does a router know if its neighbors are down or not?

So first off, do ethernet sends ack frames or not? if it doesn't : then how does a router know whether its neighbors are down or not? if it does : then is it cumulative ack with an ack timer or one ...
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2answers
4k views

Is the MTU of Ethernet still 1500 Bytes?

So basically do the modern routers in the internet still use 1500 as the MTU of Ethernet? or the 1500 Byte was for the old days? What I'm asking here is what is the MTU of Ethernet in modern Networks?...
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2answers
3k views

Cisco Router (ISR4221) Throughput - Why so slow?

I'm looking for a new router for a new branch of hour company. I got experience with cisco L2 & L3 Switches but not that much with Routers. I was looking at the ISR4000 series, specifically the ...
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2answers
526 views

load balancing with multiple ISP, one router and asa 5520

I connected different two ISPs to the RV340 with dual WAN support. I want to connect the ISP - Router - ASA in the normal way, and connect the L2 Switch after the ASA. I need to know how to do DHCP ...
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3answers
71 views

Pinging computer on a local wireless network, what exactly happens?

I'm trying to get a better understanding of networking in general. Here's one of the many questions I got: What exactly happens (network wise) when I ping 192.168.0.5 from 192.168.0.3, when both are ...
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2answers
80 views

Routing beetween two hosts [closed]

In a virtual network, I have two hosts,let's call : A and B with ip addresses of 10.0.0.1 and 10.0.0.4. Beetween the hosts there is a router with two different network cards,and two different ip ...
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1answer
108 views

Cisco: Router can ping Internet, Clients cannot

I'm currently playing around with a Cisco 819 LTE-integrated (C819G-4G-G-K9) router at my summer place to get a better LTE-signal and control that the ISP router provides me. Currently I'm stuck at ...
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2answers
521 views

Unable to ping internet from switch

Router internet interface Fastethernet0/0 192.168.0.17 (ip nat outside) internal interface 192.168.1.1 (ip nat inside) able to ping 8.8.8.8 from router Interface IP-Address OK?...
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0answers
20 views

Is possible to access BT Hub from local network (behind another router) or remotely? [closed]

Setup: Internet access point: BT Business Hub 5 -> office router/firewall (draytek vigor 2830 router with build in firewall, standard setup) -> local network Problem: Access to BT Hub from local ...
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0answers
69 views

SSH into device attached to another router [closed]

I saw this questionwhich looks kind of related, but I'm not sure as the answers are too confusing. Basically, I want to SSH into my Raspberry Pi from my laptop. Eventually I want to have the Pi ...
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0answers
21 views

Linking an Actiontec router and a Synology router [closed]

My Verizon FiOS connection is an old one, using COAX cable from the ONT to a Verizon-provided Actiontec M1424WR Rev I Router. I just ordered a Synology RT2600AC router which, I have been informed, ...
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3answers
3k 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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1answer
56 views

Routers and RIP violation of isolation?

I'm studying networking from the book 'A top down approach' from Kurose and Ross. In the book it is stated that routers are generally considered Layer 3 devices (i.e. implementing the stack up to ...
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2answers
267 views

How do I automate ssh sessions with a Router Ericsson IPOS?

I am trying to automate the healthcheck process of a router by running a centralised script from a linux server. I am so far able to access the router server without password prompt using ssh and rsa ...
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1answer
92 views

Sys Routing Table Router: Destination IP, Gateway IP and Public IP are different, something unusual? [closed]

I am currently studying my home network router Sys Routing Table and attempting to resolve WHY my Public IP (assigned by my ISP), Gateway IP (WAN) and Destination Network (WAN) are all different. I ...
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1answer
314 views

Load balancing between two routers [closed]

I have the following network: On LAN A, I have several hosts connected with two routers to LAN B. My goal is to use R1 and R2 to route traffic to LAN B/R3. For that, there are two solutions: 50% of ...
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1answer
44 views

Router - can I remotely force a router to send my packets through a specific route? (in packet/network layer) [closed]

I'm a newbie in network programming in C/C++ and I'm working on raw sockets to program a simple ping or traceroute application as they are written in common network programming books. Programs like ...