Questions tagged [switch]

a device that bridges network segments, operating at the OSI link layer level.

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Could a faulty switch cause upload speeds for some to be slow?

We have recently switched our MSP which has caused a lot of problems with our network, but most of that is fixed and we've got one issue remaining: Half the people in our office have poor upload ...
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0 answers
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Three routers, one switch [migrated]

I have a problem. The broadband ISP in my area is really unreliable, so I have decided to get an "Airfiber" subscription along with the one I have. The idea is to connect both routers' LAN ...
6 votes
9 answers
76k views

Cannot ssh into cisco switch: Invalid key length

For some reason I cannot ssh into a Cisco Catalyst C3750 Switch. This is the error message, that I get: ssh_dispatch_run_fatal: Connection to 192.168.7.6 port 22: Invalid key length This is the ...
-1 votes
1 answer
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Weekly reboot of network switches [closed]

Seeking opinions on a perplexing IT practice: a company regularly reboots customers' switches weekly. This seems counterintuitive and could lead to issues, especially with multiple connected devices. ...
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31 views

Can a FortiGate's "software switch" defined as FortiLink be also used with 3rd-party devices?

I need to connect a couple of FortiSwitches to a FortiGate HA pair over FortiLink. I'm thinking to define a "software switch" object as FortiLink, rather than LAG or concrete port - for ...
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1 answer
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Ideal method to virtually connect two ports transparently in a switch [duplicate]

I have an Aruba 2930F 48G PoE+ 4SFP+ switch. It has mostly default configurations, therefore all ports act as if it is transparent. The router is a Belkin RT1800 running OpenWRT 23.05.2. The internet ...
-2 votes
2 answers
88 views

Ip routing two subnets

I've got two subnets A: 192.168.2.0/24. Within A we have got a firewall and a connection to the internet. B: 172.16.12.0/24. They are connected with each other via a switch and both subnets are ...
0 votes
1 answer
85 views

SAN VLAN configuration

I'm repurposing an old SAN device for some additional non-critical storage on a VM on a 3-host S2D cluster. I can't dedicate the switches at the moment like what seems to be recommended so I need some ...
0 votes
0 answers
22 views

Unable to access switch management interface

On one of my sites, I have a Netgear network ecosystem. This is typically managed by the Netgear insight cloud portal. One of my switches is unreachable from the cloud portal, it also can not be ...
0 votes
1 answer
7k views

EdgeRouter X as VLAN-only Switch

The Ubiquiti EdgeRouter X (ERX) has a switching chip on board so that it can be used as an L3 switch instead of as a router. I have another router, we'll call it router-core, which is serving an ...
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1 answer
113 views

How do I deploy correctly my DHCP Servers with DHCP Option 82?

My Goal is to achieve a seperate DHCP Pool on my switches, how am I able to achieve it on a flat network hosted for a LAN-Party. Which means seperate VLANs should be avoided We're talking about ...
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How do I achieve a guest wifi set up with a Draytek AP810 and a Netgear GS728TPv2?

We have recently moved offices and so our facilities are bit more limited than they were before. We have a basic internet router (a BT Smart Hub for UK people) that doesn't have VLAN options and 4 LAN ...
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1 answer
240 views

How can I connect two switches with the STP enabled over one port, and without blocking ports

I have a question, if I want to connect two boards and each board has internal switch(like below topology), as you know that in general, the switch might have STP(Spanning Tree Protocol) enabled in ...
3 votes
1 answer
15k views

Compatibility of QSFP28 and SFP+ ports

Question Can I connect a 25Gbps QSFP28 port to a 10Gbps SFP+ port using either fiber or copper? Background I'm building out a network with some high speed interconnects coupled to a slower gigabit ...
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0 answers
36 views

Zyxel GS1920 IPv6 switch does not provide hostname to DHCP server

I have setup IPv6 in my network. All Zyxel switches do not provide an hostname to the dhcp-server for IPv6. For IPv4 they do! Is there any setup, e.g. via dhcp-options, to make the switch transmit the ...
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2 answers
596 views

Switch seems to be allowing only one device

I have a simple 5 port switch which I recently connected to the ethernet jack in my office. There is a main cisco switch for the entire office lan. Anyway all my devices were connected, I could check ...
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2 answers
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How do I provide Internet Access to both of my VLANS?

I have a TP-LINK T1600G-28TS, and I have 2 different VLANS (10.0.0.0/24 ID 101 and 10.1.1.0/24 ID 102), their IP addresses are defined by the switch's DHCP server. This part is working fine, I can see ...
0 votes
2 answers
142 views

Aruba 1930 to build Lab Network separated from office network

Here is the network i need to build for our company lab: Note: All is centered on the Aruba 1930. Network A - 192.168.178.xxx/24 Port 25 on Aruba, SFP+ 10 Gbps -> Cisco SFP+ Gbps -> Router -> ...
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1 answer
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How to check total operating hours for Cisco Catalyst switches?

We bought about 25 Cisco Catalyst (9300 & 9500) switches and about 200+ SFPs from a distributor with whom we've had trouble in the past - i.e. they sent us refurbished hardware when we ordered new....
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How to get connection details on an authenticated port of an Extreme X450-G2 switch?

I have an Extreme X450-G2 switch which has 48 ports. On one port (port 22) I have an active link (LEDs blink, webinterface shows that the port is active), yet I cannot seem to find out what is ...
-1 votes
1 answer
49 views

whitelisted VLANs with L3 Managed Switch routing

I have a basic setup for self-learning purposes. I'm a developer but trying to also understand the other side of IT managing networks. I mean learning case I have a single managed L3 switch. To it are ...
0 votes
1 answer
47 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, ...
2 votes
1 answer
193 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 ...
0 votes
1 answer
479 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 ...
2 votes
1 answer
727 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, ...
15 votes
3 answers
3k views

Improvements for small business network?

My question is more-or-less a newer version of this 3 year old question: Small Business Network Switches/General network configuration Summary Everything is Gigabit and we don't have any real ...
0 votes
1 answer
285 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 ...
4 votes
3 answers
8k views

Cisco SG200-26 - Can't change management VLAN

I've purchased a new SG200-26 switch and upgraded it to the newest possible version: I configured multiple VLANs - nothing special - however if I try now to change the management VLAN (as I did ...
0 votes
0 answers
37 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 ...
0 votes
1 answer
366 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 ...
1 vote
1 answer
350 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....
0 votes
1 answer
168 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 ...
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1 answer
3k views

Ethernet cable only works in laptop, not switch

I have installed a new ethernet cable and for some reason it works just fine when connecting a laptop to it, but when plugging it into the switch at that end, no connection is established. Tried with ...
0 votes
1 answer
443 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 votes
2 answers
55 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 ...
5 votes
7 answers
9k views

Configuring a custom HTTPS certificate on a Netgear Switch (e.g. GS724T)

Since it’s quite annoying to get the invalid certificate warning every time I connect to my switch, I want to install a custom HTTPS certificate signed by a Certificate Authority my machines trust. ...
-2 votes
1 answer
84 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 ...
0 votes
0 answers
124 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 ...
0 votes
1 answer
230 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
82 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 ...
0 votes
2 answers
38 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 ...
0 votes
1 answer
91 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 ...
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0 answers
36 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 ...
0 votes
0 answers
461 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). ...
1 vote
1 answer
569 views

TP-Link switch redundancy

At the moment we have 12 switches of the type TP-LINK TL-SG1024DE. These switches are connected in serie now, which means when one in the middle goes down that all the others in the chain will loose ...
4 votes
1 answer
9k views

inter VLAN routing with Ubuntu

I have 4 VLANs created and I'm trying to use my Ubuntu machine as the DNS,DHCP, and L3 router. I want my 4 VLANs separated but still able to talk each other. Here is a bit about my setup. Cable ...
1 vote
1 answer
2k views

Can Ubiquiti UniFi PoE switch be used as unmanaged switch before adopting?

I know some managed switches can just be used as an unmanaged switch out of the box, but I have a site with a UniFi US-16-150W PoE switch which nobody knows anything about how it is/was setup or ...
2 votes
2 answers
2k views

How to fix DHCP server after main switch replacement

I am a computer science teacher in a small school who is getting to grips with a role as server/network admin. Today, we all lost internet connection and were unable to access the server remotely. It ...
8 votes
4 answers
9k views

Cooling requirements for POE switches?

Is there any difference between POE switches and normal switches when budgeting for cooling capacity for a network closet? Normally, when I'm thinking about cooling; I can look at the power draw of a ...
0 votes
0 answers
186 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. ...

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