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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Is it possible to point a static IP from OVH (or any provider) to a system with a dynamic IP? [closed]

I have a few spare IP addresses from OVH, I'm wondering if it is possible that I can run something on a the server or even my PC (at home) to make the IP address from OVH always point to my routers IP ...
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1answer
133 views

How is the MD5 hash calculated in BGP?

The RFC is very superficial on the implementation details. What is the injective function being used? https://tools.ietf.org/html/rfc2385 MD5 digest is produced by applying the MD5 algorithm to ...
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2answers
2k views

What's the DF flag mean in IP packet header?

In the IP package, there is DF flag: Don't Fragment. I have doubt about it, is it mean let all the L3 device do not to fragment the IP packet (if the L3 device found it is bigger than MTU, device ...
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1answer
256 views

BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
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2answers
14 views

How to find specific device in a network without brute force?

I have an Internet of things (IoT) device with known MAC address, which is connected to a network. First, lets assume that this network is large (subnet 255.255.0.0). Is there any "smart" ...
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3answers
274 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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0answers
18 views

Simple chat program between machines in 2 countries [closed]

I want to get a practical experience in Networking (I have read the basic theory), hence I decided to establish communication between 2 hosts (in different countries) connected to the Internet. This ...
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0answers
11 views

Networking configuration and submitting [duplicate]

The 131.181.112.0/22 network is provided. a) Determine the number of subnets that can be obtained with that IP address b) Determine the number of available hosts on that network. c) Design 6 subnets ...
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3answers
71 views

Sending an ipv4 packet to the Destination IP without a router?

We are replacing a "RF modem + Router system" with a Software Defined Receiver. After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received. The ...
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0answers
7 views

Nat Loopback | Nat Reflection | Nat Hairpin [closed]

I am using beetel 777vr1 , I done the port forwarding with help of friend. Now Issue is i am facing is I can access the website from the outside of network using my public/static IP. But when i try to ...
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1answer
19 views

Trex not receiving any packets

This is my setup to benchmark my server Diagram Trex version v2.88 Trex server MAC ens2f0: f8:f2:1e:5c:bf:78 ens2f1: f8:f2:1e:5c:bf:79 DUT server MAC eth0: fa:16:3e:1c:be:82 eth1: fa:16:3e:d5:37:b1 ...
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1answer
22 views

Connect two places 400 meters away at 10 Gigabit

we are a small media company with 10 gigabit networking using a couple Netgear Switches and CAT6 Ethernet to all the computers in our office. We expanded to a new location recently which is around 400 ...
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0answers
8 views

How to develop a new protocol? [closed]

I'm a certified CCNA, web developer and a programmer(I code in Java & python mostly). Although that I understand the concepts of networking I want to expand my knowledge further and code a ...
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0answers
8 views

Network controller showing 3 different transport id [closed]

There was a problem with my network controller so i opened up cmd and started to check for interfaces. I noticed a strange thing that my Wifi network controller had 3 different Device ID (Transport id'...
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0answers
6 views

Does all 802.11ax routers include MU-MIMO? [closed]

I'm trying to buy a new router and had a question that I couldn't find anywhere else. Do all 802.11ax routers come with MU-MIMO? How can I tell if a router supports MU-MIMO?
4
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1answer
105 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
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3answers
64 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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0answers
6 views

not able to access my server using public IP [closed]

I am using TP Link router and local internet provider GTPL. I have server on which I am hosting my website but not able to access it using public ip. I am able to access in same lan with local ip like ...
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4answers
71 views

Are there any alternative devices to routers?

I am not talking about the router used at home to access Internet . I am talking about devices used in the network core. I want to know if there are alternative devices, if any, used for forwarding ...
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0answers
8 views

How to detect packets using http or other application layer protocols? [closed]

I am writing a program which can detects protocols used in network packets. For every packet receives it will try to detect protocols in layers such network and transport. Detecting protocols in ...
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0answers
13 views

Open an application with “runas a different user” by passing the username pop-up [closed]

On a windows laptop, when I open Sql Server Management Studio (SSMS) (or any other application like Visual Studio or mstsc [RDP]) as "run as a different user" , a pop-up appears asking for ...
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0answers
9 views

Online Classes Server Problem [closed]

We have a Super Micro server (112 threads - 512 GB RAM) and we have 4 VMs on it. two are moodle (LMS) and two are Adobe Connect servers. Each LMS is connected to one adobe server (4 IPs). Now we have ...
2
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3answers
302 views

Where does an access network begin and end?

My book's definition for access network is "a network that physically connects an end system to the first router (also known as the "edge router") on a path from the end system to any ...
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0answers
29 views

Is there any logic to how IP address topology is organized globally? [duplicate]

IP addresses are designed as 4x8 = 32 bit identifiers, 000.000.000.000, representing a hierarchy of organization. Each level in the hierarchy can store 2^8 = 256 networks. In theory, this design can ...
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0answers
20 views

Beginner Basics; thank you in advance for your time and kind consideration [duplicate]

If PCs connected across the same broadcast domain can send and receive frames based on the MAC address and do not intend to leave the local area network, then why do they need an IP address? Since IP ...
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3answers
39 views

One client: static IP vs Static lease DHCP vs. DHCP limited range to 1 slot

I want to attach one client (only 1 maximum) to network router ethernet port. I want to always know the client's IP address, for my port forwarding settings. Using DHCP with range the client IP could ...
3
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2answers
727 views

What is the difference between GPON ONU and ONT?

The Optical Network Unit (ONU) and the Optical Network Terminal (ONT) GEEPONs can both connect with an Optical Network Terminal (OLT) via fiber cables in order to achieve an Optical Distributed ...
1
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1answer
18 views

Why does CLAT in 464XLAT architecture use Stateless NAT64 instead of Stateful?

As of my understanding, stateless NAT is using 1:1 translation, meaning it needs one IPv4 address for one IPv6 address vice versa, thus not preserving IPv4. Since the CLAT is supposed to be router/...
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0answers
9 views

Please solve this question [duplicate]

b) An organization is granted the block 211.17.180.0/24. The administrator wants to create 32 subnets. i. Find the subnet mask. ii. Find the number of addresses in each subnet. iii. Find the first ...
2
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3answers
44 views

What does “terminating incoming connections” mean and what does it imply for network security?

During a recent conversation with a network security team, one of them said: "Look, if that server is terminating incoming connections, it must be in the DMZ." What does it mean to "...
0
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1answer
104 views

Can not add a Physical port into LAG

Using SuperMicro network module, which related to Intel SDN product, the command PDF . and the Web GUI manual. there I have qe57, qe61, qe65, qe69 four upstream ports, I want to aggregate them to one ...
0
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1answer
28 views

Whether the Propagation delay contains the signal from chain into the cache queue?

From the wikipedia: Propagation delay – time for a signal to reach its destination and from the slideplayer.com I found the image: there seems the Propagation delay represent the signal transport ...
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2answers
50 views

Difference between Reverse Proxy and Port Forwarding

Well both reverse proxy and port forwarding looks for any incoming packets destined to a particular machine which is present in local network. How both of them are different ?
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0answers
14 views

Cisco ASA 5516-X Wont communicate on inside interface at all. No packets

I'm configuring a brand new ASA and the Firewall refuses to communicate on my inside interface. No matter the traffic type, its denied by implicit deny every time. I was hoping to get some feedback/...
3
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2answers
165 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
0
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2answers
75 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 ...
1
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1answer
36 views

Does the first TCP FIN packet (active close) goes with just only FIN bit set?

Suppose we have established TCP connection. The active close process assumes the FIN packet been sent to trigger TCP connection closing. But I can't figure out, is this first (active close) FIN packet ...
1
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2answers
44 views

Routing infrastructure doubt. It is a functionally design this?

I have design the following network diagram, but I cannot figure out if it could cause some issue on the network: Some detail about the infrastructure: Network connect Ext rtr A, Int rtr B and C is ...
1
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4answers
95 views

Assigning IP addresses to multiple switches

Thank you in advance for taking the time to read my question, i appreciate it. I am in need of help on IP assigning to 4 brand NEW Araknis switches that I am replacing with the current netgear/tp-link ...
1
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3answers
60 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
0
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1answer
57 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
0
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1answer
23 views

Are there broadcast/collision domains on non-Ethernet networks?

What if we have routers or hosts connected via ATM, Frame Relay, or SONET; that is, what if we have IP over SONET, IP over ATM, IP over Frame Relay, etc., do we still have broadcast domains and ...
0
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1answer
20 views

Is an extra port opened when accessing localhost:port? [closed]

Imagine a program serves "Hello World" on localhost port 6000. If I visit localhost:6000 in Chrome, is an intermediate port opened to send back the response? From the POV of the server, the ...
1
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3answers
3k views

what is difference between MSS and Window Size?

What is actual difference b/w these two? 1) I have gone through many tutorials on Youtube where some have told that Window Size is what total packet size it can receive eg Window Size is 15000 bytes ...
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0answers
14 views

What is the best way to match packets across pcap files from different capture points? [closed]

I have multiple pcap files which contain data from different capture points in the network. Previously I thought that by using the IP-ID field I can match the packets across the capture files but I ...
1
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2answers
47 views

Using WAN IP for a host instead

I have a single static public IPv4 address from my ISP. So I understand that i can just forward all traffic using port forwarding to one of my private IPs, but still I am wondering if this is the ...
0
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2answers
51 views

Congestion control in transport and network layers in TCP/IP

Why do we need congestion control in BOTH the transport layer and network layer in TCP/IP model. Cant we be good enough with control in just one of the layers only? And how do they differ?
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2answers
28 views

Ping responses to the Gateway

Last week, I have experienced a strange scenario with Adtran NV3448(a router) and an ISP circuit. Adtran is a similar company like Cisco, also makes networking equipment such as Router, switches, etc. ...
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0answers
12 views

How does the IPv4 Total Header Length field & Fragmentation work together? [duplicate]

I recently learnt that the maximum value of the IPv4 Total Header Length field is 65,535 which equals approx. 65.5KB. To my understanding, it is different from the IHL field as it includes the ...

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