Questions tagged [networking]
For questions about networking in general. Any question about all on topic network devices can use this tag.
337
questions
0
votes
0answers
6 views
Block The Subnets of The S2S VPN, allow only one IP of S2S to the Router on both Sides tp-link er6120 [closed]
We have Router of TP-link er6120 on both sides.We enabled s2s VPN on both the routers
We need to block all the IPs of the Remote Subnet and allow only specific IP to the Router to control traffic .
0
votes
0answers
10 views
Cluster web servers project [closed]
Can anyone help me with an article about a cluster web servers project which must include 3 VM :
2 VM must have a software package with web server functionalities ( Apache Nginx) and them must be ...
0
votes
0answers
4 views
interface error [closed]
I'm unable to ping interface s0/0/0 on R2 from anywhere. I can ping everything else though. I'm not sure what might be wrong with R2 s0/0/0. This is a list of IP's that i set up for the interfaces:
R1:...
0
votes
0answers
7 views
Unable to find local IP of my IPTV box [closed]
I am trying to determine local IP of my IPTV box provided by my ISP as part of my internet/TV package. The TV works, but I still want to find it on the network in order to scan it and analyze traffic.
...
0
votes
0answers
9 views
Mininet-Wifi or SDN-WISE? [closed]
I am new in the field of Software Defined Networks, more precisely SDN for wireless sensor networks (SDN-WSNs).
I have started creating some topologies for a SDN-WSNs networks to manage sensors from ...
0
votes
2answers
26 views
How to Change the Date on Cisco Catalyst 3750x Switch
We are using cisco catalyst 3750x 24 port switch series
How to Change the Exact Date(Singapore) on a Switch
ASW-G-L09-001#show running-config
Building configuration...
Current configuration : 11883 ...
0
votes
1answer
15 views
Cisco networking (difference between serial connection an copper straight through)
What is the difference between using serial connections (ex: serial DTE, DCE) as compared to using copper straight through in a connection between routers? Is there any situations where serial ...
-2
votes
0answers
12 views
Connect 2 buildings to same ISP without ethernet [closed]
The router is in the house and inside the house needs to have ethernet + Wi-Fi availability, the garage also needs Wi-Fi & ethernet availability. I would like to have the garage on a different ...
-1
votes
0answers
7 views
cannot ping in private network after changing IP [closed]
I have two devices in my private network. One computer has IP 10.42.0.1 the other has IP 10.42.0.173.
I can ping from one computer to another and vice-versa.
If I want to change IP from 10.42.0.173 ...
0
votes
1answer
25 views
Linux networking + mix of auto-negotiation of yes/no [closed]
we have 10 servers with Advertised auto-negotiation: yes
as
the machines with driver driver: i40e
driver: i40e
version: 2.3.2-k
firmware-version: 10.51.5
expansion-rom-version:
bus-info: 0000:12:00.0
...
0
votes
0answers
14 views
What's the flows of a IP? [closed]
In a configure file, there are the below configures:
this is for IP address.
# Limits for attacks
threshold_pps = 20000
threshold_mbps = 1000
threshold_flows = 3500
what's the flows of a IP? ...
2
votes
2answers
64 views
Fiber link loss on Cisco Catalyst 3750x series switch
I have cisco catalyst 3750x 24 port switch series switch, and the switch has C3KX-NM-10G module.
Problem :
I have connected fibre optic in SFP+ transceiver on G2/TE1 (Uplink). After 7 to 8 hours, the ...
-1
votes
1answer
16 views
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 ...
0
votes
3answers
39 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" ...
0
votes
0answers
23 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 ...
-2
votes
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 ...
0
votes
0answers
8 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 ...
1
vote
1answer
264 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 ...
-1
votes
0answers
7 views
When each device on the network has its own IP address why we need data link layer address or MAC address? [duplicate]
I am totally confused about why we need a data link layer when we have a network layer
0
votes
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 ...
2
votes
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
...
4
votes
1answer
108 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 ...
-1
votes
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 ...
0
votes
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 ...
2
votes
3answers
310 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 ...
1
vote
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 ...
1
vote
1answer
19 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/...
-1
votes
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
votes
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
votes
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 ?
0
votes
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
votes
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 ...
1
vote
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
vote
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 ...
0
votes
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 ...
1
vote
3answers
61 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
votes
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
vote
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
vote
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
votes
2answers
54 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?
0
votes
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.
...
0
votes
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 ...
2
votes
2answers
109 views
What will happen if a server receives a duplicate SYN for an existing connection?
If a server receives a fresh SYN packet for a connection that is already established, what should it do?
I have already seen What will happen at server side if it received 2 SYN packet from the same ...
0
votes
1answer
37 views
Ethernet Frame visualization
One IP packet is fragmented in multiple ethernet frames at sender's side
And at receiver's end, all the frames are combined to get back the IP packet
So is there any way to see what payload each ...
0
votes
2answers
69 views
Why does IPv6 NS not use unicast address but multicast
This is a follow up of Why not put unicast address in IPv6 packet containing NDP neighbor solicitation instead of solicited-node multicast address?
The accepted answer makes no sense.
It states the ...
0
votes
2answers
30 views
What's the Destination unreachable ICMP packet(ICMP payload the UDP) usage? [closed]
In my Mac(192.168.2.228), it will send ICMP packet to my house's router (192.168.2.1).
with the info Destination unreachable (Port unreachable)
and in the Wireshark packet detail panel, there ...
1
vote
2answers
136 views
Is this UDP diagram wrong?
I was just wondering if anyone can tell me why all UDP diagrams I have seen list a request from the server to the client as the first point of communication? Take a look at the following diagram for ...
0
votes
1answer
56 views
How do I properly serialize a network packet [closed]
So I'm currently writing a program that is essentially just a server and a client. The idea is that I want them to be able to communicate with one and other by sending packets back and forth. And I'm ...
0
votes
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 ...
0
votes
0answers
14 views
How to find which protocol is used by lower layers? [duplicate]
When we type https://stackoverflow.com/ all the data which is sent to this server would be using HTTPS protocol in transport level
So is it possible for me to know which error detection, flow control ...
