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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Setting up Hardware for HA

After designing this I went in to start configuring equipment and quickly realized I was missing alot of information/understanding. So the switches (A) between the modem and routers, do they need to ...
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1answer
105 views

Assigning IP Address ranges - Protocol, Best Practices [closed]

I am looking for standard procedures when assigning a range for static ip addresses. Which are the most commonly used approaches and why. I am trying to look on the internet and this forum, however ...
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1answer
71 views

Tacfire net protocol [closed]

Now I'm working in a system that has two machines communicate with each others using a protocol called tacfire net protocol, I have no information about how this protocol works or its message ...
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1answer
11 views

Layer 2 managed switch and layer 3 switch

If you have layer 2 managed switches which have VLAN's on them, do you still need a layer 3 switch/router?
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1answer
33 views

Routers and layer 3 switches for connecting two buildings on site using fiber

I understand layer 3 switches are essentially routers, but often don't have the capabilities a router has, e.g. NAT. So I'm trying to work out where it would be necessary to have layer 3 switches vs ...
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1answer
52 views

Is it possible to setup IPsec behind NAT without port forwarding?

We want to setup a IPsec connection between customer sites and our office so we can manage the hardware we place at customer sites (e.g. barriers). Its important that the VPN connection stays up all ...
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1answer
36 views

TCP Handshaking Meaning of RST

I am trying to implement TCP handshaking but receive RST instead of ACK: No. Time Source Destination Protocol Length Info 62 24.622012890 192.168.0.147 ...
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1answer
23 views

Understanding IP scheme, distribution and usage [duplicate]

I'm new to networking and I'm doing my best to understand how things work. I do have a problem in understanding IP scheme idea (even though obsolete), more specifically, their structure, distribution ...
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2answers
31 views

Who owns the in between routers displayed when I execute a traceroute command?

When i traceroute a website, i get the IPs of all the routers in the path between me and the website. Who owns all those routers? Are they organized in a particular kind of building?
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62 views

What steps must be accomplished in each layer of the TCP/IP model to connect a website?

What steps must be accomplished in each layer of the TCP/IP model to connect a website?
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1answer
26 views

Getting network traffic of a remote IP? [closed]

(Not sure if this is the right place to ask) I want to get the network traffic and packets of an IP outside of my network from IP. For example, I can sniff my own network using Wireshark. Just like ...
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1answer
25 views

Why there is a statement of FIN packet is easy to discard in the networking?

In Nmap port scan there is a Covert scanning which use FIN for scanning, but it is not accurate, because the FIN packet easy be discard in transmission. Why there is a statement of FIN packet is ...
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3answers
53 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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30 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 ...
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1answer
33 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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1answer
48 views

Unable to receive logs from a device to our SIEM Syslog server via TCP 514 [closed]

I want to collect logs from a security device (McAfee Email Gateway) to our SIEM Syslog server. This security device can forward logs only via TCP syslog on any port (in our case it is 514). We are ...
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1answer
27 views

telnet connection response if port is closed on firewall [closed]

If port xxx is not open on a firewall, what would be the telnet response when attempting to open a telnet session from a remote host in network "A" connected via site-to-site VPN with network "B"? ...
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1answer
32 views

Does transmission delay affect both outgoing and incoming traffic?

If the transmission delay is the time it takes for a router to put a certain number of bits onto a link, why wouldn't it take the same amount of time to take them off the link? Thus making the total ...
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2answers
87 views

How to check if any network connection is quite stable

Is there any ways that we can understand a network is quite stable? In previous time a serial network interface did fail sometimes to establish a connections. Now I have replaced a new one [...
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1answer
245 views

Why using Telnet with SNMP? [closed]

Recently I got a question asking what is the reason to use SNMP in combination with telnet since using 2 protocols is not a good practice. I did a research on the topic but could not find reasonable ...
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1answer
60 views

Setup VLAN within fiber SFP switch with a ROUTER

Good day, I am simulating a setup as below: The configurations as below: 3 switches are joined with fibre optics in TRUNK mode. PC0 joined to gigabit port of switch in VLAN 20 (192.168.2.55/24), ...
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1answer
119 views

Scaling fragment offset

I studied that fragment offset has 13 bits. At transport layer segmentation is done considering the the MTU at lower layers (network layer, data link layer). Ethernet format says the maximum data ...
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1answer
45 views

Is destination MAC address is always end point MAC address? [duplicate]

To simplify if the destination is on a separate network would the source still does ARP request or does it uses default GW's MAC as destination MAC?
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1answer
48 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
600 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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1answer
84 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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1answer
61 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
166 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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1answer
202 views

How to get MAC address on same sub-network without IP [closed]

Currently I am working on a research project, let's say we have two computers connected over LAN cable directly with out any switch or router in same sub-network. Both nodes not have IP address ...
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1answer
51 views

Setting up VLAN [closed]

One of our clients has an intranet connection and they are reluctant to use internet for our needs (data collection). They have 4 buildings. 1) Admin 2) Canteen 3) EM 4) Mill The configuration ...
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1answer
70 views

How would I add 4 buildings to a WAN [closed]

As you can tell im new to networking. I have created this LAN template for one building. The other 3 building's topologies are similar. The buildings are located in the same city. https://gyazo.com/...
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1answer
2k views

How can all devices connected to the router be in the same subnet? [closed]

I have understood that router is a networking device, used to connect multiple subnets. And it does the job of routing the packets from one subnet to another subnet. As depicted in the below topology- ...
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1answer
610 views

How to use Dijkstra's Algorithm? [closed]

I am trying to do as many examples as I can to practice Dijkstra's Algorithm however, I am confused with this particular problem as I do not know how to go about it. To solve questions like these, how ...
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0answers
10 views

Are there any limitations to having a router connected to a router? [closed]

I have router A in a very bad spot so I've been thinking of power-lining one of its LAN ports to another location and connecting another router there. This second router would have its own clients but ...
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0answers
23 views

How do I setup a datacenter in my home [closed]

So I am buying 50 blade servers tomorrow for $1600 and I plan on setting up a datacenter. (I have been given the option to colocate or set it up myself so I am not worried) I have a 1gbps home ...
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1answer
24 views

iperf3 UDP tuning

I am trying to test throughput in the network. But when i start iperf3 client for sending UDP packets it sends TCP SYN packets. Why does it behave like this? (it should not send udp tcp syn while ...
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0answers
7 views

Azure Private Link [closed]

In Azure Private Link, how is it possible to have for example a SQL server which does not have an internet gateway, NAT devices or a public IP address but still being able to connect externally ...
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0answers
10 views

How to access a local server from the internet? [closed]

I have a web server locally, but I would like to be able to access it from the internet. I configured No-ip on the server and created virtual servers in Load Balance, TP-Link and ISP modems. But ...
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0answers
21 views

VPN placement on router behind firewall [closed]

Currently our config is: ISP Router > Firewall > Internal Router Equipment: Firewall is a SonicWall NSa 4650 and the Router is a Cisco RV345 We want to use a VPN for site-to-site purposes but ...
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0answers
5 views

Network Address Translation between different computers [closed]

Suppose you have two computer CA & CB. Both are located behind the NAT’s (Network Address Translation) and have following credentials. CA’S IP Address CA’s Port Number CB’S IP Address CB’s Port ...
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1answer
27 views

TCP retransmission and then RST to a single IP [closed]

What can you tell from the following wirehshark capture? Occasionally I'm having issues connecting to the destination IP. So if someone can tell what could be possible causing the TCP retransmission ...
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1answer
18 views

Does Telnet need to be activated on both devices I am using or not? [closed]

I've searched everywhere for the answer to this question but can't find a simple yes or no. Basically, I have a virtual server hosting some services and then a physical panel PC in another part of the ...
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0answers
13 views

CCNA static IPv6 interface id understanding question [duplicate]

Hello, Can anyone advise why I would add ::1 to a subnet in IPv6? In this case I am looking to use the global unicast address and not the link-local even though I would normally do this.I would add ...
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1answer
16 views

Whether PPTP Client need virtual interface to communicate with PPTP Server? [closed]

We know in PPTP VPN, the VPN Server is using a virtual Interface to provide encrypted data. Whether PPTP Client need virtual interface to communicate with PPTP Server? and more, if yes, whether ...
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1answer
27 views

filling routing table with next hop addresses

in a multi hop network when the packet leaves the source is it loaded with all the ips of the stops on its journey, then at each hop it checks the bitmask with the nodes routing table to see if this ...
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1answer
16 views

Some questions about a DMZ and where to place my web servers? [duplicate]

Currently i build a new network for our company which is not my specialism as i'm actually a software engineer so excuse me when this is a stupid question. I read a lot about networking last few ...
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1answer
21 views

Additional subnets in a class C IP [duplicate]

If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have? would it be ...
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2answers
62 views

Why cant i reach the other network while i have added the routes and firewall rules to allow traffic? (Pfsense/USG200)

I have 2 networks, the current one and the new one. The current one is not configured by me and one big mess and contains heavily out dated hardware (especially servers). I want to be able to access ...
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0answers
6 views

Why does the sender assume that packet n is lost if it receives 3 back to back ACKs of packet n-1? [duplicate]

I came across an unjustified statement in my study notes regarding TCP: If sender receives 3 duplicate ACKS back-to-back, it assumes that the next packet in sequence was lost, and re-transmits. ...
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1answer
46 views

Create IPSEC VPN between three Routers?

I'm attempt to build essentially an IPSEC tunnel mesh between three Cisco IOSv routers. I've been able to build an IPSEC tunnel between two directly connected routers but once I add the third router ...