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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Why router treats receive-adjacency packets differently than transit IP packets? [closed]

A router see two type of packets Transit packets: Packets with destination not directly connected to the router. Receive-adjacency packets: Packets with destination directly connected to the router. ...
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Attempting to login to Rlogin, returns huge random string [closed]

I am decently new to Rlogin, and I am attempting to log into my home networks uucp-login port on 541. When I log in, I receive this: [WS▒wu▒rѐ@dQ▒s:▒▒c▒▒▒W▒J▒▒ ▒▒▒ ▒▒C▒▒S ▒▒295k=▒0▒,▒(▒$▒▒ ...
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One layer 2 switch in the middle of router network

In general, The connection should be like PC---SW---ROUTER---Many ISP router---Router---SW---PC so the packet will be from layer 2 ---layer 3---layer 2 What if I put one layer 2 switch in the network ...
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Can 2 modems connected to the same router interfere with each other if their web access interface are the same IP address?

Here is information about the network: I have 2 WAN connections to the same ISP which they provided 2 modems for and configured them to be in bridge mode. My MDF router (pfSense) connects both of ...
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Customized IPv6 packet with multiple inner data fragments for multiple destinations

I am studying the possibilities of using IPv6 potentialities to design a customized IPv6 data packet that has the following features: 1. Combines many fragments of different data in one packet. For ...
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Cisco IR829GW - Stuck booting into Rommon Mode 2

No confreg commands are recognized. No set variable commands are recognized. At first I was able to factory reset the router and go into the initial configure boot menu options, then from there I ...
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My PCs aren't able to ping each other successfully. Why? I think my Ip route is the problem? I am not sure

I have a topology of PCs A, B, D, and E, 2 routers R1 and R2, and 4 switches A, B, D, and E for each of my PCs respectively. PC A IP is 201.4.100.1/28 with a default gateway of 201.4.100.2, PC-B IP ...
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Is it possible to set maximum 32 PAT translations per global ip address?

So basically I'm trying to configure a cisco router (c7200) to use PAT with a pool of global addresses, and each global address should only support a maximum of 32 private addresses. I've been ...
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How to properly configure OSPF protocol?

I have this simple 3 router network that I need to configure the OSPF for, when using two routers every thing works fine and i can ping but when I add the third router nothing works left router ...
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GNS3 Router Telnet Configuration

I configured the IP address and telnet for my Cisco router but on GNS3 it shows a different IP address. When I ping the router from my Ubuntu virtual machine using the IP address I configured the ping ...
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Is BGP always required when you have multiple ISPs?

I am trying to understand when is Border Gateway Protocol needed and I stumbled upon this question: When is BGP needed? The chosen best answer says: You could peer with your service provider and ...
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Public IP Configuration which has a private gateway

I bought a public IP from my ISP and they provided me with the following details. WAN IP :10.129.69.157 LAN IP : 196.188.173.32/30 How do I configure this on my side ? The told me to do configure as ...
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Does a router need ARP to send data to router in anther netwrk, it already has the IP address of the interface right?why does it need the MAC address? [duplicate]

i am studying off this https://www.practicalnetworking.net/series/packet-traveling/key-players/#arp but my question is if ip address is for end to end communication , how is the end to end happening ...
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WiFi password: What is the exposure? Is it only local or can WiFi password be used remotely somehow?

(As everyone does) I have a local WiFi password that is used for signing in and using the WiFi for local users. I have a separate & far stronger (64 char) admin password to gain access to my WiFi ...
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How to correctly setup a DHCP server in the following network?

So, I've got the following Network Configuration: Assume that, on the graph, "PCs" can be any device that needs an IP(apart from a router). Now, as explained on my title, I want to run a ...
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How ARP works [Specific Case]?

After reading about ARP and NAT I'm really confused about putting them to work together. Let's suppose we have a router A with a public IP of IP(A). Plus, 2 devices behind that router B and C, each ...
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What happens if the layer 2 destination MAC address mismatches?

I was wondering, what happens if I send a packet with layer 2 destination (say 1ebf) different that what will receive it, lets say a router (mac 22ff) recieves it. Will it drop the packet? Or ...
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Is it okay to not assign an IP address to the physical interface of router when used for "Router on a Stick"?

When setting up "Router on a Stick" interVLAN routing, the steps I have seen only covered creating sub-interfaces for each VLAN and assigning an IP address to each of these sub-interfaces. ...
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Does each computer/smart phone use electromagnetic wave with different frequency to communicate when they're connected to a WLAN?

I read some papers about WLAN and Wi-Fi. They say that modern WLAN/Wi-Fi uses a kind of technology called "OFDM(Orthogonal Frequency Division Multiplexing)". My understanding is: ODFM means ...
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Is the header of any other layer (other than the Data Link layer) is also removed and re-added when reaching a router?

Based on my understanding, when a packet reaches a router, the Data Link layer header (and trailer if there is a trailer) will be removed from the packet and a new header (and a new trailer if there ...
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Does a router need to have an IP address?

Does a router need to have an IP address? if the answer is yes, then what is the router IP address used for (one reason I can think of is NAT, but not all routers are used for NAT)?
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Do all routers have two IP addresses?

I know that a home router have a private IP address and a public IP address, but what about the routers that an ISP uses, do these routers also have two IP addresses?
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In what situation would normal choke packet be preferred over hop-by-hop choke packets?

When the host is far away, it makes sense to use hop-by-hop choke packets to resolve congestion. But is there situations where normal choke packet is more appropriate? And by the 'source' we mean a ...
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Why I’m getting overlaps with fast Ethernet 0/1 when assigning an ip

But I have been receiving error code when I want to assist an ip to s1/0
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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 ...
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1 answer
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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 ...
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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 ...
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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 ...
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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=...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
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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, ...
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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 - ...
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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 ...
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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://...
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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 ...
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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. ...
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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 ...
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WAP configuration consistency

Simple question, are WAPs always configured from the default gateway's web interface? Do you ever have to go somewhere else?
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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 ...
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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.
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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, ...
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1 answer
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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 ...
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1 vote
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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 ...
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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 ...
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2 votes
1 answer
181 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 ...
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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 ...
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