Questions tagged [switch]
a device that bridges network segments, operating at the OSI link layer level.
1,517
questions
2
votes
1
answer
111
views
Port forwarding fails with two DHCP Servers/routers on the same network
TL;DR I have two routers and a switch, and have forwarded port 80 on both routers to the switch, but depending on which router gives the switch its IP, it'll have that as its default gateway, and I ...
- 141
0
votes
1
answer
14
views
Cisco IOS - mapping out ports with arp, mac-address table, and interface status
I've unfortunately been tasked with determining which switchports connect to what- be it a connection to another switchport, or a link to a host. Basically determine what each port is connected to, ...
- 220
0
votes
1
answer
53
views
VLANs and Bridges on Debian to share the same address
Right now I have a simple topology with the debian gateway, few managed switches and access points.
I'd like to add 3 VLANs to my topology and maybe use 802.1Q on debian gateway, so that all the ...
- 11
0
votes
1
answer
63
views
VLAN - cable between two different vlans
I've got two "Aruba instant on" switches, and am practicing working with VLANS. I'm only configuring switch A, and pinging switch B to make sure I have a connection.
My PC is hooked up to ...
0
votes
0
answers
34
views
Intermittent workstations with no network connectivity
I have a campus wide network with ~10 workstations around campus(not from the same switch) that can't connect to the internet/network, they are successfully acquiring an IP address from the DHCP ...
- 11
0
votes
1
answer
126
views
Connecting 10G SFP+ slot to 1G SFP slot
Will connecting a switch operating in fixed 10GB mode and SFP+ slot and SFP+ module,
to:
A server's network adapter operating in fixed 1GB mode with SFP+ slot and SFP+ module result in damage to the ...
- 13
1
vote
1
answer
143
views
Can wrong SFP module damage equipment?
SFP modules convert electrical data from the equipment to optical signals. There is no incoming power surging from an optical port to damage the equipment according to my undarstanding of fibre optics....
- 13
0
votes
1
answer
49
views
How to tell if a switch is forwarding LLDP traffic
How can I test if a switch is forwarding LLDP traffic?
(an engineer for my router's company said that most switches do, and can cause problems for their router, so I'm trying to chase this; another ...
- 1
-1
votes
2
answers
49
views
Splitter switch with multiple network
With an increase in informatics insecurity in companies, I try to increase the security of my network, but I encountered a problem trying to set up my ideas. Right now, each person in my company is on ...
-1
votes
1
answer
77
views
Block unusual traffic from LAN on Switch [closed]
I was wondering if on HP Switches (2920 for example) is there something like storm control but for unicasts?
Let's assume, we have a host in our network who bruteforces some random IP addresses. How ...
- 17
0
votes
0
answers
53
views
Aruba to Juniper EX4200
So I have a bit of an unusual situation -- I'm trying to use a EX4200-48-PoE juniper switch with our Aruba (HP) network in place -- just as a transitional move as we're doing some construction to give ...
- 59
0
votes
1
answer
106
views
Questions on 40GBe QSFP+ to 4X 10GBe SFP+ breakout cables
I run a small(~400cores) Linux cluster.
I am using aggregated 10GBe ethernet ports(with Netgear XS728T), but now considering an upgrade to 100GB ethernet with QSFP28 ports(Mellanox SN2100).
As I don't ...
0
votes
0
answers
41
views
Multiple authentication mechanisms on HPE switch
Question
Is there a way to configure multiple authentication mechanisms for SSH logins on an HPE switch? Either I did not find that in the manuals yet, or there is no information on that topic.
This ...
- 175
0
votes
2
answers
36
views
Can the USW-Enterprise-48-PoE-EU be used in Britain?
I need to purchase a USW-Enterprise-48-PoE as our infra,
is already Unifi based.
needs all 48 PoE ports.
is short on rack space.
USW-Enterprise-48-PoE
As the USW-Enterprise-48-PoE-UK is currently ...
- 131
0
votes
1
answer
38
views
ESXi with 1 vSwitch using multiple teamed NICs each connected on a seperate physical switch for resilience/redundancy
I've read many posts (even from vmware) saying that in ESXi, NICs teamed in a vSwitch should all be connected to the same physical switch.
I found nothing about what I am describing below and in my ...
- 1
0
votes
0
answers
31
views
Finding network topology issues
I am trying to check a network with redundant links for possible issues with switching (STP?) and/or routing. I have a feeling that the issues are intermittent but I'm struggling to find a method how ...
- 101
0
votes
0
answers
239
views
Configure DHCPv6 on a Layer 3 Switch
I am training under Packet Tracer and I would like to be able to assign IPv6 addresses to my VLANs using a Layer 3 Switch as a DHCPv6 server (Between Layer 3 Switch and PCs there is a normal Switch). ...
- 11
0
votes
0
answers
31
views
Cisco 3860 is not honoring write mem or copy running-config startup-config
I have a Cisco 3860. I have configured it so much that I have it all memorized and down to a couple minutes at this point.
I configure the switch and everything works.
I add my trunk port
I add ...
- 101
0
votes
0
answers
17
views
How can i set up my SunOracle Switch?
I am posting this question to see if anyone can help me. What I am trying to do is network my 2 hosts one being my proxmox machine and the other being my truenas scale machine into a sun oracle ...
0
votes
0
answers
150
views
Tagged port does not work (switch netgear)
I have configured 2 VLANs with firewall (pfsense), but when I set port as tagged in each Vlan, every device lost wan connection and even IP address... I have no idea what could possibly be wrong. ...
- 1
0
votes
2
answers
228
views
Can you connect two PC ports with different subnets to one unmanaged switch?
We're in the process of designing a machine with a Windows PC inside its electrical cabinet (a Beckhoff IPC like this one). Among other things, there will be some GigEVision cameras connected to that ...
0
votes
0
answers
33
views
Managed switch filters unicast DHCPOFFERs, but allows broadcast DHCPOFFERs?
I have a network containing N managed switches. Each of them is configured as a DHCP server and should assign predefined IP addresses in a port-based manner:
Switch 1 assigns 172.17.1.1 to the device ...
- 33
0
votes
1
answer
202
views
Can I measure the performance of a linux software bridge using this setup?
I need to measure the performance of a linux network bridge (https://wiki.archlinux.org/title/Network_bridge) on a particular machine (machine A). My initial idea for a setup looked like this:
...
0
votes
1
answer
389
views
How to extend amount of VLAN's via external Managed Switch on Linksys WRT Router on OpenWRT 21
Goal is to create more than 4 VLAN's leveraging external ports on Managed Switch all under control of the Main Router (Linksys WRT with 4 built-in switch-ports) running OpenWRT 21.
Linksys Managed ...
- 1
0
votes
0
answers
45
views
Why does connectivity differ for straight and crossover cabling towards 1Gbit MDI-X capable switch (from Linux OS)?
There's no constraint with directly connecting a Realtek 1000/100/10Mbit transceiver towards a common router.
There was no connection ('Could not activate connection: Connection 'Name of Lan ...
- 111
0
votes
1
answer
911
views
How can I connect two routers to the same switch
First of all, I'm not talking about those all-in-one routers that do wifi/switching/routing. It drives me nuts when people call a Wifi box a "router". Anway, I would like to do the ...
- 564
0
votes
0
answers
101
views
Some Double Nvr Problems in same Network
We have a network camera system with 60 ip cameras. I realized today that some of the cameras are freezing. Approximately 30% cameras are freezing. I check cameras itself and network cables; all ...
0
votes
1
answer
148
views
Import Custom SSL Certificate in Zyxel GS1920-8HPv2
I have a problem with importing a server ssl cert for
https web connection on myZyxel GS1920-8HPv2.
On the WebGui of the Switch, there is an information, that the cert and key
has to be in a pkcs12 ...
- 1
0
votes
1
answer
417
views
Jumbo MTU and switches
I have a network with several file servers, workstations and application servers. For simplicity we can consider it all attached to a single switch, say Dell 4032F with maximum Jumbo MTU size of 9216. ...
- 1
0
votes
1
answer
143
views
Use of dual-port NIC
I was wondering, what is the purpose of a dual-port NIC on a blade compute unit, in the context of a datacenter rack, like which of these configurations is more in line with modern datacenter ...
- 11
0
votes
0
answers
12
views
SANBOX 5602 - Having diffculty changing control from XP64 to Win10
We use a Sanbox 5602 to route fiber data from several Xyratek Raids to several PC workstations. Had used XP64 workstations in the past, now migrating to Win10. Cannot get any version of Java to work ...
-1
votes
1
answer
144
views
Please explain this traceroute
What might cause the middle two RTT to timeout. This happens every time. Users are reporting slow network access from the remote site. We have contacted Meraki and they have not found anything wrong. ...
- 1
0
votes
1
answer
89
views
iptable's ip forwarding results in weird behaviour
My target is simple : Build a high volume, fast, low latency soft switch using IP forwarding. I have a server test 'Server' and 2 test clients : 'Client1' & 'Client2'.
'Client1:c1' is sending udp ...
- 113
1
vote
0
answers
103
views
Unable to ping through router switch router
## Question
Why in firewall_2 routing table rip address is not showing like router_b?
As I done Rip routing In Firewall_2 as shown in the right side image
rip:
192.168.1.0
192.168.2.0
209.165.200.0
...
- 13
-2
votes
1
answer
180
views
Can two servers talk to each other via TCP by this configuration? [duplicate]
This is an interview question:
There are two servers on Rank A, setup the network on the two hosts by following configuration:
Server A: ifconfig eth0 10.10.15.129 netmask 255.255.255.0 up route add ...
- 1
0
votes
1
answer
29
views
Diagnosing switch support for LACP and Link Agreggation
How can I tell if an airgapped switch supports LACP and link aggregation?
- 1
3
votes
0
answers
603
views
LinuxPTP slave not using master and sync timeout tx announce timeout
And:
I'm using G8316 as swtich with ptp transparent enable and Mellanox 354 adapter.
Ports using LACP bonding and trunk.
First: Server A ptp4l -m -l 7 -i xxxx -i xxxx -S
I can capture ServerA ...
- 133
1
vote
0
answers
150
views
Can't connect Fedora computer to LAN via switch
I am trying to network a few computers on a LAN with a switch (no internet necessary). The networking devices I have available are a router, a managed switch, and an unmanaged switch. when I connect ...
- 111
0
votes
0
answers
22
views
Connection drop
Trying to solve this problem here but not 100% sure what's the issue.
4 Fetal monitors and a PC in a clinic are connected to a switch. Those communicate with the PC. 1 to 4 times a day there is a ...
- 1
-1
votes
1
answer
156
views
Connecting iPad Pro to the internet via Ethernet
Okay, so you would think my client wanting to get an iPad online via ethernet would be simple and straight-forward way for me to earn $20. When I arrived, this is the setup I found:
The iPad Pro (...
0
votes
1
answer
135
views
Dell S5296F-ON: Are there any logs which can tell why so many dropped packets?
The Dell switch model info:
# show version
Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2021 by Dell Inc. All Rights Reserved.
OS Version: 10.5.2.3
Build Version: 10.5.2.3.316
Build Time: ...
- 378
0
votes
0
answers
150
views
Cisco Switch - Enable Telnet using HTTP
I'm trying to automate the configuration process of a Cisco switch (SG-300).
I was able to automate everything I need using telnet, but the last issue I still have is to enable telnet itself.
For now ...
- 103
0
votes
1
answer
128
views
Understanding dropping of packets to fight against an DDoS Attack
I always wondered how big tech companies could fight against DDoS Attacks reaching nearly 1tbps+. From my understanding traffic can't just disappear so even if I drop all e.g udp packets via iptables (...
2
votes
2
answers
274
views
Selecting a network switch for basic VLAN use to segment logical networks
I want to change my small office networking setup to use VLANs. Currently all users are on the same network with different group users sitting in the same room. I thought VLAN would be just the cure I ...
- 381
2
votes
1
answer
455
views
Accessing TP-LINK TL-SG1016PE switch behind reverse proxy
I am trying to access my switch through my Nginx reverse proxy. I can access the switch fine using the local ip over http, but when I try with the domain name through my reverse proxy with over https, ...
- 21
0
votes
1
answer
173
views
Shared network attached storage - trunked with multiple vlans?
I am introducing an NFS server which I would like to share with KVM guests across different VLANS. I am trying to find a solution which would strike a good balance between function, serviceability, ...
- 13
0
votes
1
answer
120
views
Set Zyxel XS1920 as unmanaged switch
I have a Zyxel XS1920 smart managed switch
https://www.zyxel.ch/de/support/download/201962_1/
I want to use it as a (very fast) unmanaged switch; like a QNAP QSW-1208. So I don't need it to be smart, ...
- 101
0
votes
1
answer
592
views
how to instert "x-forwarded-for" data to http header in physical l4 switch?
0
In the L4 switch, there is an 'x-forwarded-for' function that puts the client source ip address in the http header.
The l4 switch can only know layer 4 information, so I'm curious how to put the x-...
- 1
0
votes
0
answers
290
views
Accessing Marvell switch via remote management interface
I have 88E6341 Marvell Ethernet switch.
I cannot access its MDIO and according to the datasheet the switch has remote management via Ethernet which I'm interested to use to diagnose connectivity ...
- 781
1
vote
2
answers
2k
views
Line protocol on Interface GigabitEthernet1/0/1, changed state to down
My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. What can I do?
Console Output:
Port configuration:
Sorry, I have only these pictures.
I'...
- 11