Questions tagged [networking]
For questions about networking in general. Any question about all on topic network devices can use this tag.
1
vote
0answers
23 views
Colocation network setup - 2 switches with each 1 uplink - redundant configuration question
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 ...
0
votes
0answers
12 views
label request message in MPLS LDP [on hold]
I am working on MPLS-LDP protocol. I have a four router topology which has two edge routers and two LSRs (LSR1 and LSR (DUT)). The routers are Linux based. On performing the tcpdump on the LSR1 ...
-1
votes
0answers
5 views
USB thethring is not working on any browser except tor [on hold]
Suddenly internet (thetherd using Android phone)has stopped working on any browser except tor.I have tried different OS and different machine also.It is only working on Tor browser.
1
vote
2answers
41 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 ...
0
votes
0answers
16 views
I think there is something wrong with NTP server [on hold]
My server has not polled to ntp server since 4 days. Is this normal?
oracle@pre:~$ ntpq -p
remote refid st t when poll reach delay offset jitter
10.136.122.185 10.65.4.43 ...
0
votes
1answer
44 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 ...
0
votes
0answers
7 views
Use Kafka or just sockets? [closed]
If I have a single raspberry PI getting a dozen different sensor data real time via different python scripts, and I want to control it by stopping or starting. What makes more sense: 1. Have the ...
0
votes
0answers
9 views
How do I force my machine to act as a proxy so it “loops” requests from one machine and sends the response back [closed]
Trying to learn some basic networking concepts here and figure this should be simple to do but unfortunately cannot figure it out
I'd like to do the following:
1) Machine 1 should know to send all ...
0
votes
2answers
27 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 ...
4
votes
2answers
67 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 ...
0
votes
1answer
44 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?
0
votes
1answer
45 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 ...
2
votes
0answers
32 views
Question about creating Subnets for a large amount of sites that will make a site-site tunnel to our datacenter [closed]
Our data center network is:
10.20.44.X/24
I want to have our sites use 10.X.X.X/24 (Site Number, VLAN, host)
EG:
Site 30
10.30.10.X/24 10.30.20.X/24
10.X would be corporate network 20.X would be ...
0
votes
1answer
38 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 ...
0
votes
2answers
61 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 ...
0
votes
1answer
46 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 ...
0
votes
1answer
58 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
votes
0answers
19 views
Ad hoc vs Mesh, which one to use?
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 ...
0
votes
0answers
13 views
Why maximum length of IP、TCP、UDP packet is not suit? [duplicate]
From many tutorials, I get follow knowledge(maybe I'm misunderstood) :
maximum of an Ethernet packet is about 1500bytes.
maximum of an IP packet is about 65535bytes.
maximum of a UDP packet is 65515 ...
3
votes
1answer
86 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 ...
0
votes
1answer
39 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 ...
0
votes
0answers
15 views
Is there currently a formula for calculating the network ID when you know the amount of networks used? [duplicate]
edit: I wanted to mention the reason I am asking is because I have scoured the internet to find a formula similar
I figured a formula and wanted to know if such a formula is was already in use.
(...
1
vote
1answer
24 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 ...
3
votes
1answer
57 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 ...
0
votes
2answers
36 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 ...
-2
votes
2answers
51 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 ...
0
votes
2answers
34 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
votes
1answer
56 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 ...
0
votes
1answer
41 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 ...
-1
votes
1answer
99 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
4
votes
2answers
750 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?
0
votes
2answers
76 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), ...
1
vote
0answers
64 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....
1
vote
0answers
29 views
What should DevOps engeneer/SRE know about networking? [closed]
What should DevOps engeneer/SRE know about networking?
Which tools\protocols\technologies? Beside different cloud-specific knowledge about network constructions and limitations.
0
votes
1answer
36 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
votes
1answer
51 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 ...
0
votes
1answer
38 views
How to aggregate four upstream ports in the network module?
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. how ...
0
votes
0answers
24 views
How to set the network module port to trunk?
I use the SuperMicro network module, which use Intel SDN product,
the command PDF . and the Web GUI manual.
Now, I want to make the qe57 port to a trunk mode, but I don't find a command to set.
192....
0
votes
1answer
28 views
What's the usage of `Data center bridging`?
show dcb app
show clock
Privileged Mode
#
Displays DCB (Data center bridging) application data.
Command Syntax
Command Modes Syntax Description
Command Default Examples
show dcb app {local status|map}|...
0
votes
1answer
17 views
Cisco ASA 5506 log collection after power cycle
Today we had to power cycle our Cisco ASA 5506 , since I could not connect to it through any of the connected interfaces.
How can I get the logs to see what failed or what was the state of the ASA ...
2
votes
0answers
44 views
Can I do Q-in-Q vlans between Dell and Cisco switch
Our Head Office is connected to our DR location between an L2 tunnel provided by our ISP.
I need to establish a Q-in-Q setup between both sides to pass multiple VLANs through. Our head office has a ...
2
votes
1answer
76 views
How to secure an aging PC from the switch/router side?
I have an aging Windows XP PC whose purpose is to feed code to a manufacturing machine via a RS-232 connection using machine-specific software. The PC needs to retrieve its code from a network file ...
1
vote
1answer
32 views
ISP Failover On A Converged Network
We have our fiber providor as our primary ISP. We have comcast as our secondary ISP and our Voip providor. We can setup the failover between the two ISPs. We also have 19 voip phones that are on a ...
1
vote
1answer
31 views
Half duplex setting switch forwarding frame collides with host forwarding frame
So my question is regarding half duplex switches connected to hosts. Consider a case where a switch is connected to a host by a single link. In an event where a switch decides to forward a frame to ...
1
vote
1answer
137 views
PVST + MST + RSTP network. Possible to make it work?
I have got a network (around 100 switches) which looks like this:
Cisco 2960 - can do PVST, RSTP, MST
MRV mr2228-s2c - can do STA, MSTP
HP 1810 - can do RSTP, STP
Two main Ciscos are linked with ...
3
votes
1answer
995 views
How to connect 192.168.1.x network to 192.168.100.x gateway?
Hello fellow networkers.
I am very new to this world and don't know a great deal about IP addresses and subnetting.
I however stumbled upon quite a big problem (for me at least - haha)
My entire ...
1
vote
2answers
75 views
Is a networking loop considered a DoS attack?
Is a networking loop considered a DoS attack?
I watched this tutorial and at 1:20:
The author says that a network loop, could be a DoS in a network?
2
votes
0answers
45 views
Switch problems: No loop, no damaged port, so what? [closed]
This is a medium size company. We have a 2960G switch as a core switch, which is connected to three 2960 series Cisco switches by fibers and clients are connected to these three ones. All of the three ...
0
votes
1answer
111 views
How do I setup ubiquiti Nanostation M5?
I connected my two NanoStation M5 devices as outlined in the manual. Now I want to login to admin and do the setup but I do not see a related ubiquiti SSID to connect to, to enable me to login to ...
1
vote
1answer
30 views
How to check a Switch GE port's link-type?
How to check a Quidway Switch GE port's link-type?
I have a S5700 switch, and I want to check its GE0/0/1 port's link-type whether is access.
I have tried use bellow command:
[Huawei]display ...
