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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VPN's Killswitch on Linux with UFW - LAN access [closed]

I implemented a very basic Killswitch on Linux for a commercial VPN, using UFW. To setup the Killswitch I followed the steps that are explained in a Comparitech article: https://www.comparitech.com/...
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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 ...
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Which factors do I consider to make my choices for a router and/or switch to optimize performance for LAN? [closed]

I’m setting up a network that will need to handle large amount of audio and video traffic in a live performance scenario. Internet access and security are not factors. The network is physically ...
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How to extend Google Nest Wifi Networks [closed]

I tried to extend my Google Nest Wifi Network using my old Google Wifi First Gen pucks but it did not work. It should have according to Google Documentation. However, according to support, I was one ...
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Why we need both private IP and Mac Address? [duplicate]

I spent hours on reading but still no clear answer to my question. Why we need Both private ip address and mac address? If I'm not wrong be can't only use mac address to prevent leaking it online (why ...
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Is Device X router or switch? [closed]

Since the subnet mask is the same which is /28. We do need to do ANDing process for the question, right? My lecturer said since it's the same subnet, we have to switch but when I use the packet tracer ...
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1answer
32 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 - ...
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2answers
72 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. ...
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1answer
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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 ...
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1answer
40 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 ...
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702 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 ...
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338 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 ...
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63 views

Does a router have multiple DLLs inside?

I came across a practice question of true/false answer type . The statement is: "A router has single network layer that will interact with 2 Data link layers" . Ans:True (no explanation ...
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Can ping from VPC 1 to router and VPC2, but can't ping from switch to VPC2 or router

I have a simple, linear topology in GNS3 that goes like this. VPC1 > Switch > Router > VPC2 I have the default static IP Routes on the router set to 0.0.0.0 0.0.0.0 Ethernet0/1 and Ethernet1/...
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How to stop automatic entry as privileged exec from console login?

I am configuring my Cisco router and trying to set up access levels. I was under the impression that level 0 was a very limited mode which almost only allows users to enter the enable command to enter ...
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5answers
115 views

How is an IP packet sent to the gateway?

This is some route command output sample: $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.240.1 0.0.0.0 ...
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2answers
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It is possible to have multiple webservers running on same port inside one network?

Lets say we have a network A with two webservers inside it, S1 and S2, both hosting a website on port 80. When a client from a different network is addressing A:80, which host inside network A, will ...
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1answer
47 views

Problems when configuring VLAN on Arista vEOS Router

I'm setting up a network on GNS3 with the end goal of configuring VxLAN. I routed 3 Arista vEOS router together and each of them has a host attached. With basic L3 routing, everything works. I need ...
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70 views

can LAN port have multiple IP addresses of same subnet mask or different subnet mask

Can the router's ethernet interface have multiple IP's of the same subnet or different subnet mask? If yes what's the use?
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Why does ARP request not use a router instead of broadcast?

Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
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1answer
39 views

Is this a good network configuration?

I am trying to configure ip sla for non directed link . I have configured static route to reach to non directed link 1 configured track 2 configured ip sla 3 configured access-list 4 configured NAT 5 ...
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1answer
47 views

Can a subnet use more than one default gateway address?

This follows another question i had previously asked.. I am in a situation where sub net A is connected to two routers {Router A{left}} and {routerB{right}}. The sub net A knows that the address of ...
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2answers
32 views

Configure router to forward packets between two switches

I have two sub nets on Cisco packet tracer, the central node(switch) that networks all nodes in sub net A is connected to a router which connects to switch B which is the central node for sub net B. ...
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1answer
28 views

ping shows different outputs

Both VLANS are working, and pings from R1 to R0 and vice versa also work successfully. But when I ping from the pink PCs to the blue PCs I get destination unreachable, and when I send pings from the ...
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1answer
70 views

how do i connect two networks with two routers in packet tracer?

I am am new to networking and I have recently started using packet tracer. I`m trying to get familiar with sub-netting and I've made a simple network that is going terribly wrong. I have 4 departments:...
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InterVLAN routing on Cisco router with multiple trunks [duplicate]

I recently came across a scenario where I wanted to (ab)use a Cisco router (ISR 4331) as a layer 3 switch. The router is directly connected to two switches. The connection between each switch and the ...
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1answer
31 views

In France , what language is the Cisco IOS for routers and switches?

If I accept a Network Engineer job in France, what language will the Cisco , Juniper, etc, IOS communicate in? If it is in French, is there an acceptable workaround that I can install in routers that ...
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1answer
54 views

Multiple IP address on an unmanaged switch

Sorry if this question have been already asked. My ISP is providing multiple public IP's on an interface. Can I use an unmanaged switch to conect to ISP's interface and then connect this switch to ...
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4answers
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If router is a layer 3 device how can it have an application interface (GUI)?

It is said that layer 3 devices such as routers do not have an application layer. But whenever I want to configure my home router I punch in the IP address and open up its graphical user interface. ...
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29 views

Ping ICMP is always sent to the same PC via switch from router

I am quite new to this world and I'm currently to understand why an ICMP ping is always sent to the same PC. In this case, I am sending a ping from PC_F to Server PT. ping 192.168.1.2 In the ...
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3answers
81 views

Why does a queue of a network device like router starts to fill up if the arrival rate equals the transmission rate of the outbound link?

In the book "Computer Networks: A Top Down Approach by Kurose" it is written that when the traffic intensity approaches 1, the average queue length gets larger and larger. Traffic intensity ...
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How does the computer detect the routers Around? [closed]

I can see any wireless modem around(networks) in internet access icon , How routers say to my computer "hey I am here ?" is it port forwarding ? upnp ? IGMP ? which protocol they send and ...
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How is it possible that CSMA/CA works in areas with a lot of users within a small radius (e.g. rallies, concerts, etc.)?

My understanding of CSMA/CA is that devices listen until a Wi-Fi channel is idle before sending packets. If a collision still happens, then the devices waits a random interval before attempting to ...
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1answer
187 views

Possible causes of ICMP Destination unreachble - Port unreachable

Are there any other causes, apart from the specific port to be reached being closed, that can lead to an ICMP Destination unreachable - Port unreachable message? What are possible reasons for this ...
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1answer
68 views

Can't ping neighboring router OSPF

I have set up an OSPF network and I cannot ping from the Edge router to Main Branch.
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1answer
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Simple lab setup in Cisco Packet Tracer

I've just started my journey into the netowrking world. I am following Ross Bagurdes course of CCNA. I am trying to setup a simple lab in Cisco Packet Tracer. To see the lab please check the picture ...
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1answer
39 views

How to uniquely identify device on LAN

I am concerned with uniquely identifying devices on the LAN. This is useful for making sure unauthorized devices did not connect to the network and try to access the router. This is also useful for ...
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1answer
66 views

ICMP packets are being dropped while pinging

I am pinging from one of the Juniper L3 interfaces to another with a rapid ping count of 10000 packets. It's a direct 100G optical connection and I am seeing 10-15 packets being dropped by the end of ...
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3answers
482 views

Multihoming with two 'good' providers - load sharing strategy?

We get two 100G links, one from each provider and our aggregate traffic is sub 100G. The rationale is one provider can fail and the other will pick up the slack with zero degradation. Our traffic ...
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2answers
47 views

Proxy-ARP when the destination device is connected to the same layer-2 switch, but belongs to a different subnet

I have recently learned about Proxy-ARP and am slightly confused about what would happen in the following scenario. Let's say I have two host devices A (IP: 10.0.0.10/24) and B (IP: 10.0.1.10/24) that ...
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90 views

Tagging a VLAN or not

I want to create a wi-fi network for guests using access points. I asked to the IT provider a dedicated network with its VLAN and it is: 172.16.0.0/24 VLAN ID 344 The above network is configured on ...
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60 views

How does a switch know when and how to forward traffic to a router

I generally understand how L2 switching works. I want to understand how a switch and router work together to send traffic to a device off the L2 network. For example. Computer A tries to send ...
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1answer
49 views

L3 Switch acting both as a router and as a switch for the same packets

I am trying to figure out if an L3 switch is able to act as a switch and as a router at the same time for the same packets. Consider the following architecture: I would like to set up VRRP for both ...
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2answers
23 views

Why Ping Reply Succcess from different subnet IPs

In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
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1answer
37 views

Two routers connected with a serial line, why they can ping each other without clock rate setting?

I'm pretty new to networking and still learning CCNA stuff. I'm reading a book and as I understand, when you are connecting two routers using a serial line, one router is considered DCE and the other ...
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1answer
54 views

IP masquerading and nat

what is the difference between IP masquerading and nat? do both of them have the same limitation? in the line "IP masquerading cannot provide full internet connections to the hosts which hide ...
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1answer
25 views

issue regarding broadcast mac address

I read a line saying {Routes do not forward packets coming from one interface having broadcast mac address (FF:FF:FF:FF:FF:FF)} what is meant by one interface in that line? if router cannot broadcast ...
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1answer
28 views

What is the difference between these two different network security devices?

I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means. SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
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Dual Juniper MX80 problem

We have 2x Juniper MX80 routers with only one currently being actively used. Second one is waiting to take over in the event of disaster. We also have two ISP's that deliver network to our MX80. We ...

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