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
2 votes
1 answer
89 views

What is Netflow Scope field?

I was looking at RFC3954, RFC7011 and some Cisco docs - however I can't find the answer for what is the Scope field? What information does it carry?
user avatar
0 votes
2 answers
49 views

After routers within an AS have their routing tables sorted, how router A make sure the packets from it take the most efficient route to router Z?

Question in the title. I know a bit about IGP. My understanding is that these protocols only ensure every router in an AS knows about other routers within the AS. So, the scenario, correct me if I'm ...
user avatar
  • 275
17 votes
3 answers
3k views

Is it possible to specify a route for a packet to take?

So, AFAIK, packets "hop" between routers. Packets are forwarded via a router's default path until it gets to destination IP. So is it possible to specify a specific set of routers this packet "hops" ...
user avatar
  • 275
0 votes
1 answer
163 views

How to connect two routers to the same network via an F-connector? [closed]

To clarify the situation, my ISP gave me a Cisco EPC3928S router which has F-connector input like shown in the picture below. On the second floor they set an additional coax cable for the television. ...
user avatar
0 votes
2 answers
74 views

Routing daemon vs router configuration

Which is the difference between a routing daemon and a router configuration? For example using BIRD you can set up a BPG session, but you can always set up a BGP session for example using a CISCO ...
user avatar
1 vote
2 answers
94 views

Why does a Router need to have a seperate IP for every network?

Assuming we have a router connecting 4 different networks, with the prefixes 00, 01, 10 and 11, the router would need to have an IP address with such a prefix in each network, to be addressable as the ...
user avatar
0 votes
1 answer
20 views

Connect via PoE an access point D-Link DAP-2610 using PoE out port of a Mikrotik Hex S [closed]

I have just bought an access point D-Link DAP-2610 and it does not come with a power supply so I want to power it via PoE using eth5 of my Mikrotik Hex S. When I plug in my device, RouterOS in Winbox ...
user avatar
0 votes
1 answer
110 views

Differences between BGP(routing protocols) and vpn mpls?

I am new to networking, so bear with me, 1-I wanted to clear my query: why do we need BGP or any routing protocols if we have vpn or wan technologies like mpls ? 2-Can't we just run bgp between two ...
user avatar
0 votes
2 answers
234 views

ARP-Request - Reply from the perspective of a router

Presume I have a route table with such entries: typedef struct route_table_entry { uint32_t prefix; uint32_t next_hop; uint32_t mask; int interface; } route_table_entry; I have a ...
user avatar
  • 101
0 votes
1 answer
52 views

Reccomended set up for wifi in dense apartment block? [closed]

I live in an apartment block of 87 units & one thing most people in it complain about is the poor cellular data reception. I have an idea of installing a fast wifi internet connection ...
user avatar
  • 3
1 vote
2 answers
65 views

Why does the host machine need subnet mask? [duplicate]

The routers require subnet mask to route the packets to other routers or hosts, but why do host machines that are not routers such as computer running Ubuntu or windows need subnet mask to be ...
user avatar
0 votes
1 answer
102 views

Find best route in route table using sorting [closed]

I am trying to implement a forwarding algorithm by myself with ARP, ICMP and the forwarding algorithms. Given the routing table: typedef struct route_table_entry { uint32_t prefix; uint32_t ...
user avatar
  • 101
0 votes
2 answers
146 views

Can two or more computers that are physically close together form a connection/network without a router? If they can, how do they do so?

So, I am pretty familiar with things when a router is used. To my knowledge, packets travel from Computer A to the router, then the router directs it to Computer B. Problem solved. I get confused when ...
user avatar
  • 275
1 vote
1 answer
113 views

Connect routers in gns3

I have a topology of three routers connected with each other. The problem is that it has a different network address on two directly connected ports of router R1 and R2. So I am not able to ping R1 ...
user avatar
1 vote
0 answers
25 views

Port forward no destination [closed]

Context: I'm running a home game server and my paranoid network administrator has allowed port forwarding under the sole condition that I airgap the server hardware when I'm not actively using it. Our ...
user avatar
1 vote
1 answer
746 views

Is WIFI like a hub, switch or router?

A wireless router; the wireless part of it, is that a layer 2 or layer 3 device? I have heard that a WiFi router is just a wired router with a built-in wireless AP, and since a wireless AP functions ...
user avatar
  • 113
0 votes
1 answer
2k views

Connecting a 10 Gig server to a 1 Gig switch

Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow: 4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port) However, we are trying to see if ...
user avatar
  • 1
0 votes
1 answer
33 views

Inducing delay in packet transmission at router level for a particular flow

I want to segregate flows at a router. I can do this by using the destination IP on the header. I also want to make sure that my router does not forward any other packet for the time being I am sure ...
user avatar
3 votes
1 answer
254 views

Why can't get host's mac address on l2 switch through snmp? But can get it on l3 router

I am trying to get computer's mac address through snmp. I have an envirmont in GNS3: l3 R1's image is vios-adventerprisek9-m.SPA.157-3.M3 l2 SW1's image is viosl2-adventerprisek9-m.SSA....
user avatar
0 votes
0 answers
548 views

when to disable CEF on an interface

i am currently learning about CEF and i came across the command "no ip route-cache cef", which i do understand what it does, essentially, it enables Fast-switching/process switching on an interface. ...
user avatar
  • 327
1 vote
1 answer
86 views

When is NAT Masquerading required?

I'm learning about NAT Masquerading and I'm a bit confused about when you would want to Masquerade. I've seen examples of using an interface for a VPN tunnel and how something like that on a router ...
user avatar
  • 113
5 votes
5 answers
4k views

How does a host in one subnet know to forward the packet to the router MAC, when trying to send a packet to another subnet

I am trying to understand the ARP protocol and I could not understand the above. Consider the topology as follows: H1(1.1.1.1) - (1.1.1.0)R(2.2.2.0) - H2(2.2.2.2) My understanding is that if the ...
user avatar
  • 59
0 votes
0 answers
148 views

Cannot create connection between two routers in same VLAN via switch

I currently have a Cisco 2960-24TT switch (switch1) and a Cisco 1841 router (router1) that form part of my core network connecting other VLANs and devices. The two ports on router1 have been ...
user avatar
  • 280
0 votes
2 answers
31 views

Cisio interface naming rule

I'm very new to networking. I noticed in GNS3 lab environment, if I want to configure IP address for an interface of a router, I can use int f0/0 or int fastEthernet 0/0. What's the naming rule here? ...
user avatar
2 votes
1 answer
69 views

Why do we need machine learning for QoS classification in SDNs if we have DSCP in IP address for QoS enforcement?

DiffServ (Differentiated services) uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. If ...
user avatar
1 vote
1 answer
127 views

Will Main Router be overloaded in this scenario?

The Main router in my planned office network assigns IP addresses to all PCs through DHCP and also connects to the internet via GPON modem. 5 PCs and 1 server are connected to a 8 Port simple switch. ...
user avatar
  • 13
4 votes
2 answers
173 views

MPLS : who owns the ingress & egress routers?

I'm trying to understand MPLS. It states that the routing doesn't happen at each router, and it starts with a "Label Edge Router". For example, if company X uses ATT as the provider for MPLS, then ...
user avatar
1 vote
1 answer
120 views

PacketTracer: Why can I not ping from one to another router?

I'm trying to ping from Router DC_GE to BE: I uploaded the Packet Tracer File (v. 7.2.1): https://www.4shared.com/file/aEsd_0Piiq/Topologie_Ausgangspunkt_MH.html CD_GE: CD_GE#show running-config ...
user avatar
  • 121
3 votes
1 answer
224 views

Router can ping and resolve hostnames, but VLANs and switch cannot

I recently installed an Adtran Netvanta 4430 to perform some basic VLANs on a network with a little bit of inter-VLAN routing, and I'm having a few odd issues, probably attributed to my inexperience ...
user avatar
2 votes
1 answer
1k views

Do two computers in the same wifi LAN communicate directly without the router? [duplicate]

I have heard (forget where) that in a local wifi network created by a router, when two computers communicate with each other, they communicate directly with each other, and their communication doesn't ...
user avatar
  • 1,505
2 votes
1 answer
166 views

What is meant by AF?

For example, route manual says: route {-h|--help} [] Detailed usage syntax for specified AF. What is meant by AF ? I tried to google the term but no success (found only something about an af-...
user avatar
0 votes
2 answers
198 views

What's the "routing-instance" in networking?

When I read this Article: there is a term routing-instance, how to understand this term?
user avatar
  • 1,737
1 vote
1 answer
58 views

IP Routing and Switching Interface Speeds

I have a question that relates to routing and switches. I am looking to set up a new Firewall that will handle the routing for the network and attached to the Firewall will be a switch. Here are the ...
user avatar
0 votes
2 answers
57 views

After configure auto secure cannot log in (Cisco router 1941)

I have used network policy server on my Windows Server 2012 r2 to manage my accounts on router 1941 but after I used auto secure to harden my router, all my accounts cannot log in anymore, any ...
user avatar
  • 3
4 votes
1 answer
5k views

How do CPU and RAM affect a router's performance?

I've seen a lot of circumstances when there are 50-100 users in the net cafes -- under normal gaming and web browsing activities with no heavy downloads -- causes the router to drop packets (leads to ...
user avatar
  • 401
0 votes
1 answer
45 views

Can I connect two devices only with access point without router [closed]

I want to connect to the tplink security camera via on it's app on my tablet. Two devices have to be connected to the same network. I don't need an internet connection. In this case, do I have to use ...
user avatar
-5 votes
1 answer
74 views

What are Cisco Devices? [closed]

I am doing CCNA online and not for a minute have I not failed to come acroos the statement 'Cisco Device' What exactly are cisco devices ? Please don't tell me 'Devices that use Cisco iOS' Can you ...
user avatar
0 votes
3 answers
193 views

How to differentiate if a Cisco device is a L3 switch or a Router?

I need to check all the L3 switches if they are configured with same ospf ID, As i am doing it in the Cisco prime, there are routers in the inventory too. Is there a show command where i can clearly ...
user avatar
  • 361
2 votes
1 answer
76 views

How to check the route table on a neighboring router?

I have a router in a network, which use to show list of routes in the route table. Using the command- show ip eigrp topology I see some of the routes are removed after sometime, which were advertised ...
user avatar
  • 555
1 vote
1 answer
55 views

Packet analyze on router does not match client and server

thank you for your time. My (virtual) network has 3 objects : a client, a server and a router between them. I'm sniffing the traffic on the 3 machine with the command tcpdump -i any -s 0 -w [path] ...
user avatar
0 votes
1 answer
92 views

Is 1111::/64 a valid IPv6 address?

As per the rules for shortening IPV6 address given in https://networklessons.com/ipv6/shortening-ipv6-addresses, this IPV6 address is invalid. But still this address gets accepted when configuring a ...
user avatar
1 vote
2 answers
97 views

Does Network segmentation work using different switches connecting to router?

I just learnt basic networking. If I have 2 departments which I do not want them to access each other's networks, does using two layer 2 switches connecting to the router does the job or do I need a ...
user avatar
0 votes
2 answers
352 views

Cisco ASA and a Router?

I'm trying to understand networking and when looking at the different routers, firewalls and switches, I came across Cisco ASA which many use for firewall and routing abilities, so if you use an ASA ...
user avatar
  • 495
0 votes
1 answer
265 views

LAN to WAN IPv4 address mapped to LAN server through NAT Rules or other

I need to set a rule that allows me to connect BOTH from OUTSIDE the LAN (from the "internet" to the Internal server at IPv4 address 10.64.0.50 via port 22, by running ssh://1.2.3.4 -p 22; AND From ...
user avatar
0 votes
3 answers
287 views

packet filtering using bridge vs router

I have a question about the bridge vs router packet filtering using firewalls. I know the basics of the router and bridge and on which layers they work. I just wanna know that on bridge how does ...
user avatar
2 votes
2 answers
261 views

How does aggregate routes behave in BGP?

If a router received two BGP updates for the same prefix and both these updates are aggregate paths how do the router decide which one to take? Let us say that it needs to decide based on AS Path ...
user avatar
  • 31
0 votes
0 answers
57 views

CISCO Packet Tracer

Does Cisco Packet Tracer support config memory and config network command? If no, then do enterprise routers still support it?
user avatar
2 votes
1 answer
399 views

How does NAT ensure that every machine has a unique public IP?

I am trying to understand the distinction between public and private IP addresses in IPv4 networking. The picture I've been told has some problems with it, so I would like to present it here and ask ...
user avatar
0 votes
2 answers
110 views

How BGP guarantees same route for a forwarded packet?

In BGP all routers choose the best route to a single destination. So for Router A and destination D, A will forward the packet to the next-hop router (let us say router R) after knowing the best route ...
user avatar
  • 31
-1 votes
1 answer
46 views

How does a router settings page work? [closed]

When we enter the routers address 192.168.x.x into our browser we get a page containing the setting for the router. How does this page work ? Is the page stored in the router ?
user avatar

1
3 4
5
6 7
31