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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1 answer
835 views

High CPU utilization on Juniper ACX2100 chassis fpc

What is the cause of high utilization of cpu on fpc.Below is the output of which depicts utilization as 99 but router is running just fine. show chassis fpc Temp CPU ...
0 votes
0 answers
17 views

why this ip addresses looks like they have the same network address [closed]

suppose there is the computer $A$,the computer $B$,the computer $C$. each device is connected to the same router , does that's mean there exists in the same network? i know that's is a weird ...
2 votes
2 answers
40 views

Can you send data in LAN without an IP?

From What I know, IPs are used to communicate b/w two different networks say LAN1 and LAN2... and MACs are used to communicate within a LAN.. I think this because my instructor says that Hubs and ...
2 votes
1 answer
57 views

Do NAT Gateways Need to be the First Address of the Network?

NAT gateways are often given the first usable address in an address space. Do any protocol specs require this? Or is this just a convention? I skimmed RFC 1918 and RFC 2663 but didn't see anything ...
0 votes
1 answer
52 views

Slow internet throughput if servers are connected on 10G. But good when on 1G?

In our datacenter I'm having throughput issues if a server is connected on a 10G port on the switch. For debugging I already removed our router and asked our ISP for a small IP range that I can use ...
0 votes
0 answers
14 views

HOW TO MAKE 2 IPS ON DIFFERENT SUBNET COMMUNICATE [closed]

I am kind of new to networking so pardon me if my question looks trivial. I am trying to make 2 LANs communicate. My infrastructure is simple, we have an ISP router => Fortinet 300E (which also ...
0 votes
1 answer
82 views

Noob: i design a network for 156 computers/4 printers, need help in few things

Sorry if this stupid questions: I just learn networking like a week. Lets say company xyz have 39 computers and 1 printer in each floor, there are 4 floors, total amount of computers is 156computers ...
0 votes
0 answers
33 views

OSPF area or ABR impact on CPU and RAM consumption

I have two statments on OSPF, are they correct? 1- If I split a single area OSPF to an OSPF domain with area 0 and area 1, and there is just one ABR between area 0 and area 1, The load on CPU will ...
0 votes
1 answer
331 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
1 vote
1 answer
26 views

ISR 4331 vs ISR 4331/K9?

We have cisco router. On its box/package ISR 4331/K9 is written. I am watching a youtube video at below link, its title has word ISR 4331 https://www.youtube.com/watch?v=bk-4jkb6Cwo&list=...
0 votes
4 answers
213 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 ...
0 votes
2 answers
559 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.
1 vote
1 answer
60 views

Why does congestion happen

Imagine a network full of routers . The job of a router is to be able to receive multiple packets from multiple sources then send the packets 1 at a time in each of its outputs.If the routers are able ...
2 votes
3 answers
675 views

Understanding Cisco standard access lists (Packet Tracer example)

Consider the following example: I have two networks (192.168.1.0 and 192.168.2.0) with one PC in each network (PC0 - 192.168.1.1 and PC1 - 192.168.2.1) and a router R0 with 2 interfaces connecting ...
2 votes
1 answer
67 views

OSPF routes are not advertised

routers with ASBR2 connecting to AREA 0 and 10 and ASBR1 connecting to area 0 and 20, there's no entry of routes in R1's routing table, help me out R1#sh run Building configuration... Current ...
2 votes
1 answer
119 views

RIP routes are not being advertised

I have 2 routers(R3 and R4 connected with serial links). I have advertised my loopbacks with RIP ver 2. with 192.168.1.1/32 and 192.168.2.1/32 on R3 and 192.168.3.1/32 and 192.168.4.1/32 on R4. My ...
3 votes
3 answers
495 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 ...
0 votes
1 answer
29 views

How router will send ARP resolve packet when it receive ARP request?

How router will send ARP resolve packet when it receive ARP request ?? Router by default enabled with proxy arp configuration?? If then proxy arp is not configured then what will happen if it receives ...
4 votes
4 answers
1k views

Do VLANs within a subnet need to have their own subnet for router on a stick?

I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to ...
1 vote
0 answers
42 views

Default admin deleted. Cant access CLI on Palo Alto but have access to GUI

I accidentally deleted the default admin for CLI on Palo Alto and now I can't log in. I have access to the GUI. I don't want to blow the image. Any ideas? What I have tried: I created a new superuser ...
3 votes
1 answer
48 views

Setting an OSPF router in one area that doesn't see other areas

Could an OSPF router be configured so that it can only see its own area LSAs and does not accept LSAs from other areas? (For example, if it is in area 2, its routing table just shows routes in area 2, ...
2 votes
3 answers
764 views

static route distance value fail over

Config: ip route 172.27.8.17/32 172.24.0.141 ip route 172.27.8.17/32 172.24.0.102 2 Result: show ip route 172.27.8.17 Routing entry for 172.27.8.17/32 Known via "static", distance 2, metric 0 ...
1 vote
0 answers
13 views

Routing correctly mesh + gatewaty [closed]

I have a router modem DSL I have 2 Aimesh Asus AX XT8 For a reason the node can not talk with the router base over WIFI (long range). I than connected the lan on the modem(DSL ROUTER) to the NODE - ...
0 votes
1 answer
19 views

What are the IP/MAC addresses of requests between 2 different subnets? [closed]

Assume that networks 172.15.10.0/24 and 172.15.11.0/24 are connected through a router with interfaces 172.15.10.254 (MAC3) and 172.15.11.253 (MAC4). If host A sends a packet through its network ...
1 vote
1 answer
3k views

pfSense join 2 networks

I've got 2 pfsense boxes taking care of separate networks, with separate gateways. We've managed to drop a cable between the 2 networks so would now like to join the 2 networks so machines on each ...
5 votes
2 answers
508 views

Rate Limit on Main Aggregated Interface (AE) without applying on Unit Level in Juniper MX

I want to apply rate limit on Main Aggregated Interface (AE) without applying on unit level. We have a customer connected with our Juniper MX480 via 100G Interface. The single 100G interface is a part ...
2 votes
3 answers
765 views

How does a router route traffic on a LAN, in detail?

Electrical engineer here trying to understand things. So I guess this might be simple or very complex, but how exactly does a router route traffic between say 2 PCs that are on a LAN? eg. PC-1 and PC-...
5 votes
1 answer
428 views

Need to configure site to site SSL VPN between two Cisco routers

I would like to configure site-to-site SSL VPN between two sites. I originally set up an IPSec VPN between the two Cisco routers and found I was only getting 10 percent of the available bandwidth. ...
0 votes
0 answers
9 views

Public IPv4 Address and Default Gateway for my home router is owned by IANA? [duplicate]

In the web interface for my home wireless router I can see the following info: For the Public IPv4 Address I see: https://myip.ms/info/whois/10.206.55.182 and for the Default Gateway I see: https://...
0 votes
1 answer
32 views

Is it possible to separate gateway function from router? [duplicate]

A gateway is an entry to another network, usually router device play the gateway function as well. Is it possible that router delegate the gateway function to a device in the LAN and make it to be ...
0 votes
0 answers
17 views

Why does a router need 2 IP address? [duplicate]

Suppose there are 2 PC and 1 router in "LAN1", now if PC1 wants to communicate with PC2, it will need to uniquely identify PC2. So, PC2 gets a private IP that no other PC in LAN1 will have. ...
3 votes
2 answers
186 views

Time taken to complete a routing table update and possible interruption

I am wondering if a routing/forwarding table update at a switching node (e.x., a switch or layer-3 router) can cause momentary packet drop or increased delay for a data stream that will traverse this ...
0 votes
2 answers
41 views

If ICMP packet is lost then another ICMP could be generated?

Suppose there are two routers between Source and destination R1, R2 respectively. Suppose source sending packet to R1 and then R1 send to R2, but R2's buffer is full and discarded the packet and ...
0 votes
1 answer
17 views

WAP configuration consistency

Simple question, are WAPs always configured from the default gateway's web interface? Do you ever have to go somewhere else?
16 votes
7 answers
20k views

Automate configuration backup (every minute) in Cisco IOS

I'd like to make my Cisco router automatically do a copy run TFTP (and populate the fields automatically) every 1 minute. I'd also like it to be run in the background. Anyone know if this is possible/...
0 votes
2 answers
116 views

How PPPoE uses addressing to know destination Mac address?

Case.1 We know that when router connected via point to point(PPP) protocol then ARP isn't used to know the destination Mac address. Case.2 When two router connected via PPP as well as Ethernet which ...
8 votes
5 answers
17k views

What is the difference between broadcasting and flooding?

In Open shortest path first routing algorithm, the information about connected links is "flooded" throughout the network. How is flooding different from broadcasting?
0 votes
0 answers
35 views

Can we still upgrade the firmware version of a 2900 router?

current version: Version 15.7(3)M5, RELEASE SOFTWARE (fc1) seems i can't find any of the upgrades on the internet.
1 vote
2 answers
65 views

Can networks with different netmasks overlap?

Let it be this diagram: Can I assign such networks at each segment without overlapping? In my understanding each network has a range of usable IPs and those ranges overlapps each other. For instance, ...
2 votes
1 answer
66 views

Static route removes another static route

In the following diagram each Vyos router has RIP configure and R1 has NAT to allow hosts from 10.0.0.0/24 and 192.168.10.0/24 accessing the internet. The goal is to put the PCs comunicating with each ...
3 votes
2 answers
552 views

Configure NAT in Vyos Router

I have the following diagram, and I want that R2 and each client connected with R2 have access to the internet. For that I configured NAT in R1 with the following commands: #set nat source rule 10 ...
1 vote
1 answer
32 views

What are the commands to configure static routes using next-hop IP addresses?

Given the network topology above and that X in all subnets should be replaced with 1. What are the commands to configure static routes using the next-hop IP addresses on r1 and r2, given that you are ...
2 votes
1 answer
165 views

When using link state routing algorithm, does each router have a map of the other routers?

I think when using dijsktra algorithm, each router's shortest-path tree can be different. And in link-state routing, all routers have the same topology of the total network. Therefore, does each ...
0 votes
1 answer
17 views

Use mac filtering for router that filters all directly connected only [closed]

I have a network where the internet is provided by a main router of the building. Each flat in the building has a router. The devices in the flat including mobiles etc should connect to the flat ...
0 votes
1 answer
127 views

How does a router handle a directed broadcast on the 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 ...
1 vote
3 answers
84 views

Longest Prefix Matching

I just learnt about this concept and I have a query which was also asked by someone earlier but was grossly misinterpreted. Suppose my Router has Routes for Networks: 192.168.22.0/23 and 192.168.22.0/...
1 vote
2 answers
3k views

Why command "ipv6 dhcp relay" doesn't work at packet tracer?

I'm trying to enable dhcp for ipv6 with the "ipv6 dhcp relay dest" command but, I'm receiving an error and I'm trying both of these commands but none work. Router model: 2811 (config)# interface [...
8 votes
4 answers
4k views

Advice for network & device configuration using Comcast Modem?

Summary My ultimate goal is to run a VPN through my Cisco Router, which to me means getting the Comcast Gateway out of the way. To this end, I would like to place my Cisco Router (and/or Switch) ...
4 votes
3 answers
1k views

Collision domain question

I'm studying for my CCENT exam, and not quite sure why the book (official Cisco) says that there are 5 collision domains in this example. Isn't it supposed to be 4? The hub on the left, the hub in the ...
0 votes
4 answers
146 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. ...

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