All Questions
16,075
questions
0
votes
1
answer
15
views
Is non-blocking per-VLAN (rapid) spanning tree configuration possible?
Imagine a pair of switches connected with a couple of trunk links created in the following fashion:
Assuming the numbers on lines correspond to different VLANs, how would you arrange a working ...
- 143
0
votes
0
answers
8
views
One IP is not reachable unless creating a route [closed]
One host can ping everything but one other host.
Let's say that I've 4 hosts in my network:
My Internet Box (Gateway) : 192.168.0.100
My Ubuntu machine : 192.168.0.1
My RPi machine : 192.168.0.2
My ...
- 1
0
votes
0
answers
11
views
Does anyone know how to create two vlan on a Askey RTF8115VW router? [closed]
Does anyone know how to create 2 different vlan on a Askey RTF8115VW router?
I would like to be able to create two different vlan, one for the first port and another one for the second one. I would ...
- 101
0
votes
0
answers
13
views
Can I get date from which RPKI is implemented by particular network operators? [closed]
Is it possible to get date from which a particular ISP or CDNs have implemented RPKI in their network ? Any idea about the available datasets ?
- 145
0
votes
2
answers
35
views
How does subnetting solve the problem of IPv4 address shortage?
Reading articles on the web, they all say that "subnetting solves the problem of IPv4 address shortage by dividing a large physical network into multiple smaller networks". I do not ...
- 125
0
votes
0
answers
10
views
Need some help to improve some network security (switch management interface) [closed]
I'm managing a network of c. 100 devices (small for most of you, but large for me...), with core components of 1 Unifi Edgerouter, 2 switches TL-SG1016DE and 2 AP Cisco WAP571. It is segregated in ...
- 1
0
votes
0
answers
22
views
Change mac-address with Netconf
I am playing around with Netconf and I try to do some configurations with the openconfig yang models. I use ncclient to send the configuration and netconfd from the yuma123 project to simulate a ...
0
votes
2
answers
19
views
ISP connected to the Fortiswitches behind the Fortigates
I have a scenario in a client that a couple of ISPs directly connect to the fortiswitches behind the fortigates firewalls instead of connecting to the fortigates or any switches before the fortigate ...
- 1
0
votes
2
answers
41
views
UDP fragmented packets not reassembled
I have been working with a device that sends me UDP packets heavily.
I'm trying to capture those packets in my Linux machine (Ubuntu 22.04.2 LTS) with Python programming language.
But, most of the ...
0
votes
1
answer
8
views
Do STP 802.1D support Uplink Fast, Backbone Fast and Port Fast?
Do STP 802.1D support Uplink Fast, Backbone Fast and Port Fast ?
Aren't these features cisco proprietary ?
Is IEEE later add these feature into 802.1D ?
If so, Why are they not called Alternate Port, ...
- 13
0
votes
1
answer
50
views
Static route is not saved - Why?
I have the following configuration. On R1 I do inter-vlan routing. The problem is when I ping the serial interface of ISP1 with PC MA11 the ping packet is not returned to R1. I wanted to add a static ...
- 179
0
votes
1
answer
18
views
Do wiremap testers detect split pairs
I was watching a How-to video on Youtube on wiremap testers and the technician said that wiremap testers detect split pairs among other wiring faults. However, I came across a Networking question ...
0
votes
0
answers
17
views
HSRP does not work on two switches. Cisco
The problem is this: clients receive IP addresses from the L31 DHCP server, but they cannot ping the gateway, although HSRP seems to be working, there are no problems, I suspect that this is a bug in ...
- 1
0
votes
0
answers
13
views
Wireguard over TCP tunnel at 443 port, blocked ports bypassing, solution for OpenWRT [closed]
Problem
I'm facing a problem - I would like to connect many embedded devices with OpenWRT to my Wireguard server, but all the ports except 80, 443 and some others are blocked. Moreover only TCP is ...
- 1
0
votes
1
answer
37
views
CISCO cellular Router cannot reach network via my PC
I configured the cellular and my router is connected to the internet ping (5/5) Success
but I still cannot access the internet via PC
Here is my running-conf
Current configuration : 2271 bytes
!
! ...
- 1
0
votes
0
answers
16
views
Command used to verify default gateway on layer 2 switch [closed]
which command is used to verify a default gateway configuration on a layer 2 switch from the following.
show interface description
show interface stats
show ip default - gateway network
show ...
- 1
0
votes
0
answers
6
views
Trace Route RTO in two or more hop but next hop works [duplicate]
Today when I was doing tracert,
in the 2nd & 3rd and also 4th Hop I get RTO but my next hop seems to be reachable. How come it works?
Please answer asap.
- 1
0
votes
0
answers
21
views
How can l block VPN connection on Network [closed]
My router is ZTE h188a I try to block VPN connection on my network
My router has in his settings
IP Filter - IPv4
I tried it but so difficult l should block all IP address to VPN which every one has ...
user88937
0
votes
0
answers
10
views
RHEL server + what is the meaning of the kernel messages about Hung TX queue XX [closed]
We have 524 RHEL machines. in our Hadoop cluster ( all machines are DELL HW )
all machines are RHEL 7.2 version (old kernel version)
last week we seen the following kernel messages on 64 machines.
[...
- 101
0
votes
1
answer
42
views
Multiple GRE tunnels towards single host using anycast IP
I'm trying to build the following network architecture:
Where clients try to connect to a backend server (e.g. SSH) by using a Public Anycast IP adddress (1.2.3.4), that routes the client to the ...
- 1
0
votes
1
answer
28
views
Is there a way to precompile data from pcap to speed up booting wireshark?
Is there a way to precompile/precalculate the data from a pcap file to speed up booting wireshark?
I have a big pcap file and wireshark is crashing when I try to open it.
I know it sums and computes a ...
- 111
0
votes
0
answers
13
views
Ports list used by program and software [closed]
Is there a list of programs and software's ports?
like:
Winamp Audio Streaming, 8000-8001
WinConnect Server ES, 3389
WinConnect Server VS, 3389
WinConnect Server XP, 3389
Windows 2000 Terminal Server, ...
0
votes
1
answer
38
views
How to implement inter-vlan routing in this configuration on L3 switch
I want to enable inter-vlan routing on L3 switch. I have accomplished this by the following commands executed on Gig1/0/16 and Gig1/0/10 and setting the respective (192.168.x.1) as gateway on the ...
- 179
0
votes
0
answers
21
views
multi-site vpn with only one site reliably addressable from the web at large
i have a small network like so:
site-31:
wan public ip (dynamic) on isp fibre is reachable from the outside world. an automatically updated dns entry is maintained to keep the ip current whenever ...
- 101
0
votes
1
answer
15
views
Kernel does not return TCP packet data to application until the next packet arrives [closed]
We have a TCP client application that interacts with the TCP server. The protocol is simple request/response with bidirectional pings.
The client in written in C, it calls read() from a non-blocking ...
- 1
0
votes
1
answer
37
views
Internet speed over wifi through walls
I understand that my internet speed over Wi-Fi will deteriorate over distance , especially through walls.
My question is, will speeds drop to a set value, or will it drop as a percentage of the ...
- 103
0
votes
0
answers
14
views
Unable to verify the identity of the landibg page of the wifi we've set up [closed]
We've set up a wifi network recently. We have a landing page that gave a certificate after registering. After receiving the credentials one can login to the website lan.internet-access.center. It ...
1
vote
1
answer
20
views
Why is MPLS label added between layer 2 header and layer 3 header of OSI model and not between headers of layer 3 and 4 of OSI model?
Is there a possibility to use any other two OSI model layers' middle positions? What is the basic concept of switching of packets with MPLS on layer 2.5 of OSI Reference model?
0
votes
0
answers
14
views
Hardware for creating an IPv4 ethernet network within an IPv6 network [closed]
I'm working on a project where I have a Raspberry Pi that creates a wifi hotspot and runs a local DNS server. I then connect some local devices to it to set up p2p communications. It's all IPv4 and it ...
- 101
0
votes
0
answers
30
views
Optimalization current network [closed]
We have at our company the current network, which has been set-up years ago by someone who is not working here anymore:
Because we had a broken router I realy had to dive in how everything was set-up ...
- 101
0
votes
0
answers
12
views
TP Link router behin another router and google services difficulties [closed]
I have a configuration with a TP-Link router behind my FAI provider router. My TP-Link have a fix IP configured as a DMZ access. Everything is fine except some Google services. Sometime some youtube ...
- 101
0
votes
0
answers
17
views
Interpretation of the name of an ITU-T document
I'm reading a document that cites a standard called ITU-T SG 13 Q5 WG. I believe that SG 13 stands for Study Group 13 and Q5 refers to Question 5. However, I don't know what WG stands for. And most ...
1
vote
0
answers
38
views
Cisco device chooses link with higher cost as the root
The problem is that psw11 (SG350-28P) is choosing the path to sw10 (C2960L-48TS-LL) with a cost of 20000 as the root instead of the path to sw56 (C2960L-48TS-LL) with a cost of 10000, even though the ...
- 11
0
votes
0
answers
10
views
Routing vs Forwarding [duplicate]
What is the difference between routing and forwarding?When the network is a packet transfer network I dont see the reason for routing since forwarding a packet between nodes requires a routing ...
- 1
0
votes
1
answer
21
views
If asa Cli gets too long, it automatically gets omitted as "$". Is there no way to stop this?
When saving logs in our environment, it is inconvenient to have a CLI omitted as $, so as the title suggests, I would like to prevent $ from being omitted when entering CLI or marking it, is it ...
0
votes
0
answers
10
views
How to make a program recognize dropped packets [closed]
I have a program to simulate a network with a packet sent back and forth from a client to a host. This simulation includes a chance for a packet to be dropped when sent. My client program is set up to ...
- 1
0
votes
1
answer
28
views
Deleting description on Cisco 9300 switch
I have a port that has a description that is not needed. How do I go about just deleting that line. Sorry for the simple questions, I am very new to the networking world.
interface GigabitEthernet3/0/...
- 21
0
votes
2
answers
34
views
Local MAC group with authenticated plus unauthenticated MAC addresses on same port
I have the following setup: Aruba 2930F switches in a flat layer-2 network, which I'm trying to separate into VLANs. These switches run AOS (not CX), firmware version 16.11.008.
And I have many ...
- 141
0
votes
0
answers
24
views
Separating ports on manageable switch and VLAN collision [closed]
In my project i have a device which is controlled by computer. This computer have two NICs. I have 3 connection ports on my device, these ports are there for connection to the computer. Also i have 3 ...
0
votes
1
answer
15
views
SG300/350 DHCP Snooping Configuration
I have recently joined a company who have Cisco SG300 and SG350 switches deployed on their network. I need to check if switch ports are trusted or untrusted for DHCP snooping. However, the option to ...
- 1
3
votes
1
answer
348
views
Is possible to use DHCPv6 without SLAAC?
Hello may (legally) occur situation when router is not sending router advertisements but is providing configuration via DHCPv6?
- 33
0
votes
0
answers
13
views
Netgear DGND3800b limiting traffic to 280mbit on fiber [closed]
So I have a Netgear DGND3800b router (n600) connected with 1.5m cat5e rj45 from a 1 gbit fiber transciever to the fiber/cable port on the router, for some reason I am unable get a speed faster than ...
- 101
0
votes
0
answers
17
views
Two devices on a network unable to communicate with eachover [closed]
I have 2 devices:
Device 1 - 4gb RPI 4b
Device 2 - 2gb RPI 4b
Both devices have static IP addresses, and the network configuration shown on ifconfig for both is correct.
Up until about 3 weeks ago, ...
0
votes
0
answers
17
views
Trying to understand nfdump output [closed]
I am trying to figure out meaning in a nfdump output, but I cannot seem to find any sources for this. For now I am mostly trying to understand what some of the categories mean.
What I have is a basic ...
- 1
0
votes
0
answers
13
views
Shadowsocks direct connection by default [closed]
Is there any way to make shadowsocks (libev without plugins) work only for specific domains, and routing all other traffic directly through my default provider?
I tried this in my "user-rules.txt&...
0
votes
1
answer
44
views
What is PPP and why does it not have a MAC address?
I just wanted clarification on what exactly PPP is and why it does not have a MAC address due to having seen that under a response to a question of how routers transverse packets to their destinations....
- 3
0
votes
1
answer
16
views
Cisco ca-trustpoint Not Adding SAN For CSRs
When doing the following to make the CSR for a certificate I add the IP Address line. But when I look at the certificate it doesn't look like the IP address is added to the SAN. In fact the ...
- 419
0
votes
1
answer
25
views
Tag Control Information Byte Order
I need to extract the 12-bit VLAN ID from the 16-bit TCI section of the 802.1Q tag in an Ethernet frame.
I already have the TCI extracted and stored as a uint16_t.
I know that bytes arrive in Big ...
1
vote
2
answers
240
views
Multiple hosts with same ip/subnet seperated by router possible?
Bit of a newb question but just curious if it can be done.
Is it possible to have multiple hosts with the same ip/subnet (eg 10.101.30.10/24) each seperated by a layer 3 switch/router, where one of ...
0
votes
1
answer
39
views
Tracing a route, from 127.0.0.1 through my network to 20.43.161.105
Greetings in the name of network engineering!
BACKGROUND:
The IPV4 network consists of the following nodes:
Node 0:127.0.0.1
Node 1:10.1.1.1
Node 2:192.168.0.1
Node 3:192.168.1.1
Node 4:210.x.x.x
Node ...
