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.

Filter by
Sorted by
Tagged with
0
votes
0answers
4 views

the tracert command with VPN [closed]

When using VPN, the tracert command to a website doesn't print the private IP address of my router. Why? I thought the route would be like this: my router -> the ISP contacting with me -> others ...
0
votes
0answers
12 views

EdgeRouter X Crashing [closed]

We've been having a lot of trouble with an EdgeRouter X based infrastructure. We have nearly 10 EdgeRouters, working in pairs with VRRP. None of them keep working more then 1 to 3 days. What happens ...
0
votes
0answers
7 views

Redirect network of on url to proxy otherwise block it [closed]

I want to use proxy only for one website URL, and if the proxy is disabled or down, the URL blocked by a firewall So in my mac os, I connect to a proxy server somewhere, and then if I open, for ...
1
vote
0answers
22 views

Pros and cons of directly interconnecting routers and firewalls vs via switch in an enterprise-network? [closed]

In a medium-sized enterprise network, let's say you have a pair of datacenter switches, a pair of distribution switches, a pair of internal core routers, a pair of firewalls, and a pair of edge ...
0
votes
0answers
23 views

Cisco 2960 and Cisco 871 - no connectivity on non-default vlans

Unable to get internet connectivity from non-default vlans. Suspect router config is not adequate Five vlans created on 2960 (10,20,30,40,50)and Gig port 0/1 set to trunk. Port f0 on router which is ...
0
votes
2answers
51 views

How does DHCP work?

I'm carrying out an experiment to test the mechanism behind DHCP. In this topology, I disable the link between the switch and the router. However, the computer still request IP address successfully. ...
0
votes
0answers
17 views

Can your router make backups? [closed]

suppose I 3 VM's connected with the virtualbox-host-only interface, I configure one VM as the router with also a bridged adapter connected to my outside network, one webserver connected to the virtual ...
2
votes
1answer
38 views

Will 2 redundant Routers configured with HSRP consume 3 IP Adresses in each Subnet?

The Problem occured while studying for my exams Problem: I have to design a Network for a Company. The given IP Adress Space is 192.168.1.0/24 which has to be divided into 4 Subnets. These Subnets ...
7
votes
5answers
798 views

Different Behaviour of a Router

There are 2 cases that I would like to point out: When the router is directly connected with 2 PCs like this, In this case, PC2 is able to ping PC3. I just configured the IP address of PC2 and PC3 ...
-1
votes
1answer
40 views

Apply Interface Default Gateway to Entire Device

I feel there may be a very simple term for what I trying to do, but I'm not sure what it is, and it is difficult to search for it in concise words. The shortest description I can come up with: "I ...
-1
votes
1answer
37 views

How can someone connect to my computer even through port forwarding?

If I set port forwarding up on my router to redirect connections on port, say, 50000 to my computer, how can someone connect to my router in the first place ? Does that mean that my router has a ...
0
votes
1answer
50 views

Why use subnet mask /30 for the internet port of the edge router? [closed]

In the following network, why should we pick the subnet mask /30 for the internet port of Edge Router 1? Since the wireless access point Edge Router 1 needs to connect to 3 hosts in LAN 1, a subnet ...
0
votes
1answer
33 views

How does a packet know where its destination is? [duplicate]

When I connect to my friend's mobile Wi-Fi hotspot, we both have the same public IP address. Now, when I go to duck.com, how does DuckDuckGo know where to deliver the packets? I mean, I and my friend ...
0
votes
1answer
21 views

Does a WiFi client vary the strength of the signal it emits? [closed]

I am using a metal container to dampen my WiFi router in the hope of reducing its radiation health risks. I'm wondering if the client device might increase its own emitted signal strength to ...
1
vote
1answer
61 views

can't ping the WAN IP of a router

I learned to use cisco packet tracer and found something confusing but actually this is not about the cisco packet tracer . I'm curious if this apply in real network as well. So i tried building this ...
0
votes
2answers
46 views

How does a border router work

Supposing, we have following pieces in a theoretical network architecture Network A: A low power IPV6 wireless network Some low power hosts: Low power devices which are connected to the above low ...
9
votes
1answer
2k views

How much RAM you actually need to keep whole global BGP routing table?

It seems that different sources claim very different RAM consumption for having whole BGP routing table information in RAM and having the router to correctly route the traffic. According to ...
0
votes
1answer
41 views

How can I set up two sub networks that can communicate by LAN but where only one has internet? [closed]

With only two routers, where one has a connection to the internet, is it possible to set up a second sub network that has no access to the internet, but where devices connected to either router can ...
0
votes
1answer
48 views

Does a router work both on Layer 2 and Layer 3? [duplicate]

According to TCP/IP model router works at Layer 3. But when data has to be transmitted to different network it is based on IP address but hop-to-hop transmission is based on MAC address. That means ...
3
votes
2answers
392 views

Why the two connected routers via PPP doesn't use ARP but ethernet use ARP?

I have read from @Ron Maupin's answer of this question that your two routers are connected via PPP (this is not uncommon), ARP will not be used , but if the two routers are connected via ethernet, ...
2
votes
2answers
362 views

In tunneling, how destination routers identify if a packet is encapsulated?

In tunneling, a packet gets encapsulated in the payload section of another packet. If the router at one end encapsulates the packet, then how the router at another end identifies whether the packet is ...
2
votes
3answers
229 views

Why does OSPF use flooding despite using multicast?

We know that flooding is only possible in layer2 switch. But in OSPF router in layer3 uses flooding with multicasting. Suppose we have one router in OSPF uses multicast address 225.0.0.9. If router ...
-1
votes
2answers
84 views

How in Distance vector routing one router communicates adjacent router through broadcast address and OSPF uses unicast with another?

In distance vector routing algorithm one router can communicates(shared the routing table) with adjacent router by broadcasting message which are in same subnet. OSPF uses flooding to unicast message ...
1
vote
2answers
167 views

IOS Memory allocation error after ping

I have written a script in Tera Term for a Cisco IR809g which pings 3 different routers(IR 809g) in 2 different networks over the cellular interface. After +- 6 hours I'm getting a Memory allocation ...
0
votes
2answers
64 views

How does one determine what the default gateway should be in a multi-router setup?

Trying to set up a network with multiple routers, very similar to what's depicted in this diagram from the FreeBSD handbook: In particular, regarding this specific diagram, what should the default ...
0
votes
2answers
97 views

Why router can't be used for converting different model of network but gateway can do this?

We know that Router can't be used for converting different model (e.g OSI model to TCP/IP or TCP/IP model to OSI) of network. It isn't a multiprotocol converter. But gateway is a highly sophisticated ...
1
vote
0answers
18 views

Personal VPN sub-network accessible through Work VPN? [closed]

I currently access my work network via Cisco VPN. At work, I have my own three computers and NAS on a personal dedicated router using my own DHCP. For several reasons, I do not want these computers to ...
3
votes
1answer
82 views

why can a router make two PCs in different subnets access each other?

Case 1: PC A: 192.168.1.2 / 24, and it connects to LAN port1 of router A PC B: 192.168.2.3 / 24, and it connects to LAN port2 of router A Given above we know A and B can't talk to each other due to ...
0
votes
1answer
32 views

Cisco 2851 Static NAT Entry - Similar Static Entry Already Exists

Thank you in advance. I have a few 2851 Cisco ISR. This is my NAT Pool config; ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28 ip nat inside source list 1 pool NAT-Pool overload ...
2
votes
2answers
111 views

Can I backup config of an EdgeRouter Lite 3 to an EdgeRouter 4?

After having worked 6 years and 24/7, my EdgeRouter Lite 3 have definitely died. I want to replace it by a new EdgeRouter 4. Can I easily use my EdgeRouter Lite 3 backup files and import it to a new ...
1
vote
3answers
190 views

Router interface on same subnet

Could someone please explain why can't be have 2 interface on same subnet? Do router use network address to forward traffic?
1
vote
1answer
38 views

What's the procedure to limit a subnet on a Cisco router from seeing another subnet when both are using NAT?

I have a Cisco 891F router. The internet is hooked up to G8. The student network is Vlan 200, and the Office is Vlan 100. (I know the internet has an internal subnet (192.168.1.5), but that's because ...
1
vote
1answer
39 views

What exactly defines a WAN?

I've found this question but it doesn't seem to answer my question. What is the "technical" definition of LAN and WAN I know that a Wan consists of more LAN's together and MAN's and it's ...
0
votes
0answers
18 views

What really a point to point connection means? [duplicate]

I know that point to point connection is used to directly connect between two nodes without any intermediate. But if we take in our world the internet(WAN) , let's say I want to achieve a point to ...
0
votes
2answers
64 views

RSTP Separation

Topology: (Ring Network A)----[Router A]-------(Possibly Ring Network C)-------[Router B]----(Ring Network B) Goals I need Router A to always be the RSTP root bridge for Network A. I need Router B to ...
1
vote
0answers
49 views

WAN ip address looks like private ip, but whatsmyip shows a public ip address [closed]

Let me preface this by saying that I'm not very good with internet networking, but I tried my best to gather information. So I've been meaning to do some port forwarding to open a server, but I got ...
1
vote
1answer
59 views

Must the host IP be contained in Router's subnet?

The settings are: manually set my host IP: 10.0.1.6/24, gateway: 10.0.0.138/24 they both know each other's MAC (arp -a shows the list) and there is a direct physical connection between them. From the ...
0
votes
1answer
39 views

How to manage firmware

Switches and routers have some firmware (similar to BIOS (UEFI) on PC). It represents a "step" before the OS (maybe I'm wrong). Can we manage this firmware just like BIOS or UEFI on a PC? On ...
0
votes
2answers
36 views

Brocade SX800 Management Problem

In my company we have a brocade sx800 backbone SW, it is not used for 4 years. Now we need it for new warehouse project.But we don't know what was the ip addresses and no info about this device. When ...
0
votes
1answer
59 views

Does router handles directed broadcast on same network?

I have started reading on Computer Networks recently(beginner), and have come across some of the doubts regarding how the broadcasting is handled by routers and switches. Assuming there are no ...
0
votes
1answer
35 views

My laptop not comes on the network when connected to cisco 2951 routing port, so it does not ping [closed]

I have assigned 192.168.1.2/24 IP to laptop with 192.168.1.1 gateway. This gateway is actually the IP address of the Cisco 2951 router port. But my laptop doesn't come in the network that's why it ...
0
votes
1answer
77 views

SD-WAN os to IOS-XE

I am trying to convert currently running SD-WAN os to IOS-XE on ISR 1100. Can anyone know how to do that? I went through some of the CISCO documentation but could not find anything effective.
0
votes
0answers
66 views

No Voice commands on cisco router

I cannot find voice commands on my router, I have licenced it but no voice commands or sip are found Its on packet tracer. Cisco router 2911 Thank you
0
votes
1answer
42 views

Are routers doing NATP possibly run out of ports?

NATP helps each connection on the client device gain a "temporary identity" on the internet, by maintaining a one-to-one relationship between its local ip-port to a WAN ip-port. The binding ...
0
votes
1answer
80 views

Addresses in router's subinterfaces overlapping [duplicate]

I can't really understand why I'm getting overlapping addresses in subnets when they're between the allowed range. I have the network 192.168.1.0/24, and I have to create 3 subnets: A - 58 Hosts B - ...
0
votes
2answers
113 views

What does a router do with a packet if it can't find the destination IP address in its routing table?

If a router receives an ARP request in which the destination hardware address is a broadcast address, and if the destination IP address is an address that the router cannot find in its routing table. ...
0
votes
1answer
40 views

Configuring routers in Packet Tracer - Simpler configuration

I am fairly new to packet tracer and know what I need to move forward with trying to figure out how to make something work in packet tracer. I have 2 PCs. Each one is connected to a router on each ...
0
votes
1answer
49 views

How does a device on one network connect to with a device on another network

So if i have two routers and each router has lets say 2-3 computer devices.I am connected to the 1st router. So if i want to connect from my device to a device on the 2nd router than I will send the ...
2
votes
3answers
771 views

Private IP address vs Local IP address

Say a router is connected to two devices. Now the router will give those two devices different private IP addresses. The router itself has a private IP address (which serves as the default gateway for ...
4
votes
1answer
358 views

Why routers change mac address of frames (and bridge not)?

I learned that router change mac address of packet with that one of its own outgoing interface, while this doesn't happen with bridges. I find it difficult to understand the logic under this ...

1
2 3 4 5
30