Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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428 views

When server has 2 NIC, device from one network can't ping another [closed]

I've successfully completed the network design and everything worked just fine until I tried to ping the computer on the edge. Well, Master server "sees" the connections on both lines, but when I try ...
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1answer
143 views

Route between two routers

This is the topology I'm working with. I'm able to ping from VPC_LAN_Ato VPC_LAN_B and trying now to ping from those lans to Router_2_Cisco. Here are the configurations for these 4 devices: ...
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1answer
531 views

Can't ping across router with two interfaces [closed]

This is the topology I'm working with. In the router, e0 is ether1 and e1 is ether2. LAN_A has a maximum of 96 clients. LAN_B has a maximum of 48 clients. VPC_LAN_A: ip 192.168.10.1/25 192.168.10....
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1answer
90 views

How do I know what is the origin IP if I ping from a router to a host of an external network in packet tracer?

When we ping from a router to a host in an external network, how do we know what is the origin IP of the packet? I searched and I didn't find a way to select which interface is the starting point of ...
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2answers
135 views

Do we send the same packets when we send the same data?

When we send the same data over a network twice, does this means that we are sending the same packets twice? I am trying to understand how my decoder works, so I command using an application on phone,...
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2answers
1k views

Juniper SRX answers all ping requests instead of forwarding

I have about 4 different subnetworks at my place, when i'm trying to ping to static device in subnetwork1 from subnetwork2 i always see that device pings, even if it's off. I assume my SRX300 answers ...
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1answer
82 views

Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...
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3answers
615 views

What's the technology of bind MAC address with IP address, for solving iP conflict issue?

What's the technology of bind MAC address with IP address? I have a problem with the LAN, such as in my LAN, there are 192.168.100.0/24, gateway is 192.168.100.254/24. user A's IP is 192.168.100.1/...
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2answers
59 views

Passing Light but No Data

Can anyone tell me what type of jumper I need to use when connecting single mode fiber to multi mode fiber? I have a run of multimode fiber that was extended with single mode. I have used both single ...
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1answer
49 views

Second default gateway on demand? [closed]

I am in to a strange network setup, Hosts on the secure network, are all under a domain and use various services on the domain. When ever the need to access web application on the more secure network ...
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1answer
31 views

Sending Frames Among Routers needs MACs?

Following this discussion: ARP request outside of LAN; Target machine or router response? I'd like to understand if router 1 sends its frames to router 2 through the same ARP process as discussed ...
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2answers
989 views

What precisely is a link?

When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link? So in the image below, how many ...
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1answer
218 views

Connecting networks from different states [closed]

Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
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1answer
174 views

Weird Juniper switch behavior

Weird Juniper switch behavior I have bought EX4300 and SRX300 on ebay to study it and started to read documentation. After some time i wanted to test my knowledge and configure it to test it at home. ...
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1answer
2k views

how p2p connections are established over the internet [closed]

it's being said that a peer to peer network is not server-based for routing and processing data and only uses server for getting the up to dated nodes addresses (probably their internet IP address) to ...
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4answers
13k views

Can anyone explain to me the difference between the PSH and URG flags in TCP segment?

According to me when PSH flag is set, it indicates that data will have to be sent immediately to the wire and on receiving side the data has to be pushed to the application immediately. When URG flag ...
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1answer
167 views

How to troubleshoot VPN packet issues? [closed]

I'm a web developer (10 yrs), and am tech savy, but don't know a lot about networking, so please forgive my ignorance. I work from home, so I'm always on my company VPN. Over the last several weeks I'...
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2answers
66 views

should phy layer and mac layer be designed together?

I have a question about the independence of the layers. I know that the layers in protocol stack are designed in a way to be independent from each other. I want to know does it mean also that we can ...
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1answer
79 views

Mac Address Flapping and switches

Is mac address flapping the reason why switches don't exchange switching information just like routers exchange routing information?
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2answers
590 views

APIPA and LAN Broadcast Domain

I just want to know can a Local Area Network broadcast domain be operated by only relying on APIPA?
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1answer
959 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
3
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1answer
171 views

ASA 5505 cant access inside network from Anyconnect SSL Connection

So I have a ASA I can connect via SSL perfectly fine receiving internet.My issue is that I cannot ping any device on the network especially the inside network on my router. My topology is a ASA 5505 - ...
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3answers
3k views

How to explain the data flow of OSI model layers in a single picture [duplicate]

Take an example of searching www.example.com in a web browser. I have some confusions at each layer and they are We have opened a web browser and searched for www.example.com. Now, As far as I know, ...
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1answer
49 views

Help with network setup [closed]

I have the following situation: Router 2 is a given. It is used by several people to go on the internet ('People we don't trust'). We are a tiny company that is supposed to go on the internet ...
9
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2answers
2k views

Why do IPv6 unique local addresses have to have a /48 prefix?

According to RFC 4193, unique local addresses will always have a prefix of FD00::/8.. but according to Wikipedia: The block fd00::/8 is defined for /48 prefixes, formed by setting the forty least-...
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0answers
152 views

Colocation network setup - 2 switches with each 1 uplink - redundant configuration question [closed]

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
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2answers
99 views

Spanning tree protocol

I have a questions regarding STP and i would like to know if STP is only a feature of layer 2 switches? i am on GNS3 and i am trying to enable STP but it tells me that there is no spanning tree ...
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1answer
68 views

Bizzare Issue - Can't connect to Sites/Server After a Variable Period of Time [closed]

I’m in desperate need of help. I have a bizarre problem that I’ve had no success in solving. See below the pertinent backstory and details. BACKGROUND This all began about two months ago. Two ...
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2answers
79 views

How does a router know it's received an OLSR message?

So I'm working on my own routing protocol based on a alternative to IP, called ILNP, and I'm having trouble understanding how a router differentiates control packets and data packets for OLSR. The IP ...
6
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3answers
408 views

Are network protocols and routing protocols different things?

When reading about network protocols it says they are a set of rules and format for communication between devices over a network, so basically an agreed way of how to communicate over a network. But ...
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1answer
272 views

Can two packets propagate on the same communication link?

Can two packets, say from host A, propagate on the same communication link while the first one is still on its way to the next point, say host B?
4
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1answer
581 views

TCP - correlation between ACKs and receive window

EDIT: I think i get it now. So a simple sliding window mechanism basically assumes the correctly received data is processed immediately. Therefore an acknowledgement implies the data was received AND ...
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1answer
387 views

Unable to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v

I'm trying to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v IOS XE 16 using the official tutorial in here Segment Routing Traffic Engineering (SR-TE) I have the same topology in ...
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2answers
230 views

Unknown Network cable

recently I found a cable in my drawer which one side has a RJ45 connector with an unknown color code of red brown black white green I tried to solve it by myself but I couldn't so I upload a picture ...
2
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1answer
228 views

OSI Model vs Network Model: Does It Matter Which One You Use?

The OSI (Open Systems Interconnection) model is comprised of the following layers: 7. Application Layer 6. Presentation Layer 5. Session Layer 4. Transport Layer 3. Network Layer 2. Data Link ...
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1answer
154 views

What is difference between "topology of network" and "geometry of network"?

In the Internet some times, we hear of the term "geometry of the network": https://bit.ly/2VqI2YO Is there any difference between the term of "geometry of the network" and "topology of the network"? ...
2
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0answers
268 views

Ad hoc vs Mesh, which one to use? [closed]

Say we have four nodes (A, B, C, D) that are arranged in a chain-like topology. A <-------> B <-------> C <-------> D Only the adjacent nodes are in range of one another (A can ...
3
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1answer
689 views

Juniper SRX320 Dynamic VPN, cannot route to Remote-Protected-Resource

Multiple VPNs setup with a Juniper SRX320. The SRX320 has an irb interface as follows: irb { unit 0 { family inet { address 192.168.120.1/24; } } } I've setup ...
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1answer
1k views

Connecting two ISPs on one network

I am working in an institute where the internet connection is divided amongst 3 different floors: Ground Floor, First Floor and Second Floor. Now since I am new to the networking, I know the ...
2
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1answer
587 views

Defining what type of casting based on IPv4 address

I'm kinda new to networking. I have a small question, how can I determine what type of casting (unicast, multicast or broadcast) is it based on IPv4 address. For example: 142.55.172.200 I tried to ...
4
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1answer
581 views

General issues with access to and from DMZ on Cisco ASA 5520

I just got my software upgraded from v8.2(x) to v.9.1(7), but I have some general issues with access to and from my DMZ: No internet access from DMZ No access to web or mail server from outside to ...
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2answers
279 views

Accessing computers from different subnets with Dell Layer 2 switches possible?

I have two separate networks, a 192.168.20.x and a 192.168.80.x each on their own Dell X1026 Switch in Layer 2 mode. I would like the ability to access shares, ping, etc from computers on the .20.x ...
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2answers
67 views

Data Transmission Rate Video Stream

Given a web-server with an sd-card (storing 720p (7.2 Mbit/s) videos and 800 Mbit/s read-speed) and a wireless interface with 1200 Mbit/s transmission speed. I have to know how many clients can ...
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2answers
55 views

Stack network power transfer

i have 2 cisco catalyst 3750G's, and a stack cable a have a question about the stack does is transfer power so do i only need 1 power cable or 2 and is there a way to reset the password without a ...
3
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1answer
595 views

Cisco Router IOS update

I am facing problem in update the IOS of Cisco 7304 router. I am upgrading from 12.4(24)T2, to 15.2(4)S7 this. but I was boot from this version 15.2(4)S7 it booted proper from flash. But when I put ...
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1answer
338 views

How to understand the juniper's chassis concept?

I searched a chassis article which is introducing the Chassis. MX960 Chassis It's a physical concept there, but I think the chassis is far more than this. because if we in the commands: there shows ...
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1answer
13k views

missing Packet tracer physical Tab

hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
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2answers
2k views

What does it mean to lease an IPv4 block?

When you lease an IPv4 block, what do you actually get? How do you get access to the IP addresses? Is there any special equipment required or is it as simple as renting a server?
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2answers
5k views

Importance of DHCP option 12, client host name

The main purpose of a DHCP server is to provide dynamic configuration for a group of hosts (mainly IP, Gateway and DNS). There are several options that can also be sent. Option 12 (client hostname), ...
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0answers
323 views

Help with network setup issue (small network)

I am trying to set up a new network for a small business, and I can’t figure out what I have misconfigured. Hoping someone can provide me with some ideas. I have 6 VLANs set up. 10.10.10.0/24, 10....

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