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.
1,588
questions
0
votes
1
answer
83
views
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 ...
- 1
2
votes
2
answers
87
views
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 ...
- 23
1
vote
1
answer
173
views
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 ...
- 13
1
vote
2
answers
468
views
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. ...
- 13
1
vote
1
answer
99
views
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 ...
user85401
1
vote
1
answer
162
views
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 ...
- 13
1
vote
2
answers
512
views
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)?
- 11
0
votes
3
answers
265
views
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?
- 229
0
votes
1
answer
77
views
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 ...
- 1
0
votes
1
answer
70
views
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
3
votes
3
answers
993
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 ...
- 51
2
votes
1
answer
105
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 ...
- 125
0
votes
1
answer
231
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
1
answer
87
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 ...
- 551
1
vote
1
answer
137
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=...
- 111
0
votes
1
answer
124
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 ...
1
vote
1
answer
72
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 ...
- 113
2
votes
1
answer
441
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 ...
- 61
2
votes
1
answer
222
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 ...
- 61
0
votes
1
answer
112
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 ...
- 127
3
votes
1
answer
111
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, ...
- 551
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 - ...
- 111
0
votes
1
answer
56
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 ...
0
votes
1
answer
105
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 ...
- 333
0
votes
0
answers
19
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.
...
0
votes
2
answers
80
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 ...
- 378
0
votes
1
answer
20
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?
0
votes
2
answers
704
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 ...
- 378
1
vote
2
answers
514
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, ...
user80646
2
votes
1
answer
130
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 ...
user80646
1
vote
1
answer
144
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 ...
- 13
3
votes
2
answers
3k
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 ...
user80646
2
votes
1
answer
196
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 ...
- 25
0
votes
1
answer
18
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 ...
- 101
3
votes
2
answers
569
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 ...
- 35
1
vote
3
answers
323
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/...
- 11
1
vote
0
answers
118
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 ...
- 111
1
vote
1
answer
721
views
Can I set fragmented IPv4 packet's DF bit to '1'? [duplicate]
If make DF to 1, can I confirm that fragmented packet with DF=1 will go through routers to the dest IP without any reassembly and re-fragmentation?
- 11
0
votes
0
answers
21
views
Which route does a cisco router prefer and why? [duplicate]
I have a small network i packet tracer whith some subnets. I connected the subnets with static routes. In one case I made two routes two the same subnets, but one is a serial connection. I wonder ...
- 1
0
votes
1
answer
593
views
Connect a router to multiple router/subnet - Cisco Packet Tracer
I'm studying DNS Server. So I try this.
Here is the flow when I request abc.com webpage from My PC.
My PC (192.0.1.2) send DNS query to Router0. Router0 then forwarding to DNS Nameserver (10.0.0.2).
...
- 103
0
votes
0
answers
20
views
How does a host use its default gateway? [duplicate]
Each host has its own default gateway and uses that to send packets outside of its network. But in each packet, there is only 1 header field for the destination IP address. So, how can that host send ...
0
votes
2
answers
372
views
Sharing one VLAN with two routers each one will route different subnet
We are transitioning to new WAN connectivity. I have one VLAN (let's say ID 10). Currently there is one router R1 that has one private subnet and one public subnet on the VLAN 10 which goes through ...
- 3
0
votes
2
answers
164
views
What is the goal of subnetting?
Im trying to understand what subnetting is and how it works, but im pretty confused.
So, from my understanding subnetting is when you take a public ip address assigned to a network, and you can then ...
- 35
0
votes
1
answer
688
views
Cisco Packet Tracer gives "Invalid IP Address" when I assign an address to a router [duplicate]
I was given an exercise where I have an IP address range and I have to configure multiple sub networks from that range. The address is 238.61.192.128 with the mask 255.255.255.128 (/25). I created my ...
- 103
0
votes
0
answers
33
views
What is the difference between the LLC and MAC sublayers of the Data Link layer? [duplicate]
The function of the data link layer layer is to format packets into frames, and control transmission of frames between devices on a LAN. Im aware of its two subprotocols which are the Logical Link ...
- 35
1
vote
1
answer
93
views
How can I use two WiFi routers with one cable to the ISP router?
Let me explain...
There is the fiber optic ISP router on the first floor, connected to it via LAN cable is a switch, connected to the switch via LAN cable is a WiFi router on the 7th.
I want to add ...
- 11
1
vote
2
answers
192
views
Bridging two networks
Good days everyday. I am a newbie networking. I just have a question.
The diagram above simplify my network setting. They are all in same location. Is there a way to connect from 192.168.0.XXX to 192....
- 13
0
votes
1
answer
119
views
Can a router port forward based on a request header? (noob question) [closed]
I'm searching for a router that supports port forwarding based on the request header.
e.g.
www.domain1.com should forward to port 80 on IP 168.0.1.10
www.domain2.com should forward to port 80 on IP ...
1
vote
0
answers
50
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 ...
- 11
0
votes
0
answers
60
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 ...
- 101