Questions tagged [switch]

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

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UDP flood alerts from router, source is from internal IP addresses?

Recently I have been receiving many UTP flood alerts from my router. The alerts are only received when most PC's in the network are on. When all PC's were turned off, I did not receive any of these ...
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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: ...
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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 ...
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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 (...
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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 ...
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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, ...
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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, ...
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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, ...
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How to get the last time a port was used on a Dell switch?

I'm currently planning a big "cleanup" on our network switches (Dell PowerConnect N2048P & N2024), so I want the get the last time a switch port was used. Since it's Dell, neither the ...
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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-...
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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 ...
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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'...
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How to isolate devices on a subnetwork? [closed]

I am an electrical engineer working for a university. Our network infrastructure does not allow static IP. Only DHPC devices can be connected to the wired network. I am responsible for an industrial ...
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How to simulate what happens inside the packet buffer of a simple switch?

I'm debugging a case of UDP packets lost in a store-and-forward gigabit switch and I wanted to visualize what happens inside the switch to better understand the gist of the problem. The scenario is ...
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ldap connection with switch HP 5700 flexFabric

Can I restrict ssh login access to my HP Switch 5700, 5800 series using active directory groups? ldap is working fine when the search-base-dn is using an OrganisationUnit. search-base-dn OU=...
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Propagate local time over NTP to LAN

I have synchronized my L3 switch to an external time server, this is working correctly. However I'm in Europe and we have CET/CEST switching and I get UTC from the configured time server. I did setup ...
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Putty trims "0" when sending to serial

I am connected to hp A5120 switch through USB 2 RJ45 console cable. I am trying to configure my switch but whenever "0" character appears in command it is not being sent. Example: <[HP]...
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Use Core Switch as an L2 Access Switch

Can I use a CORE switch as an ACCESS Layer 2 switch? The end goal is to connect all servers through at least a 10Gb network. The servers each have high volumes of data that will be transferring back ...
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Routing different subnets on a switch

My setup: I have a layer 2 managed 7-port Ethernet switch (KSZ9897). The switch features dot1Q (VLAN) and dot1X (ACL). ACL is advertised to be able to filter on layer 3 (IP) and 4 (TCP/UDP). Is it ...
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Nexus 3548 subinterface statistics missing

I am trying to get statistics for subinterfaces on a Cisco Nexus3500 C3548P-10GX switch. The subinterface is configured for a port channel as shown below. interface port-channel3.1802 encapsulation ...
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Filtering traffic between ports on an ethernet switch

I would like to know if there is a standard way of limiting traffic between ports on a managed Ethernet switch? I have a 7-port Ethernet switch (microchip - KSZ9897), which is a layer 2 switch, but ...
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Why won't 2 switches auto-negotiate (link down) when direct, but will work at 10/100 (or at 10/1000 with other switches)?

I cannot understand why 2 switches won't auto-negotiate or communicate at 10/1000 (1000Mbps) when connected directly together. But they will communicate at 10/1000 with other switches. Can anyone help ...
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Q: Arista, can you read spanning-tree status via SNMP

Is it possible to use SNMP to read the spanning-tree status from Arista switches? Although it is possible to set up SNMP traps for spanning-tree, I did not find anything related to spanning-tree in ...
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Limiting hosts on a network

I am in need of some networking advice and hopefully some of you will be able to help me. My network is shown in this block diagram: The ethernet switches are from Microchip, model KSZ9897, which is ...
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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 ...
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Network with two gateways and a managed switch

I am no network engineer, but I have to find a solution to a networking problem for work. Any help or advice would be of much appreciation . I have the following network topology: https://drive.google....
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Bonding 802.3ad Ubuntu 20.04 and Aruba 6300M

I have a problem with bonding mode 802.3ad between Ubuntu 20.04.3 and switch aruba 6300m. Any problems : The bonding work fine but after a reboot i need to shut / no shut my lag on 6300M switch for &...
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Am I still limited to gigabit speed if the file transfer is happening between same VLAN on the same physical ethernet port and same host machine?

Consider the following: Gigabit Switch port16 configured to have native network of VLAN10 (192.168.10.x) and tagged VLAN20 (192.168.20.x) and VLAN30. This port is plugged into proxmox machine. Proxmox ...
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What Ethernet twisted pair cable is best with a particular Ethernet switch

tl;dr I want the appropriate Ethernet cable for my Ethernet switch. How do I correlate Ethernet cabling speeds measured in hertz with an Ethernet switch "speed" measured in bits-per-second ...
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Significant throughput loss when sending data from 40G to 10G/1G ports

Not too long ago I put together a 40G network using a Mikrotik CRS354-48G-4S+2Q+RM switch as the backbone of it. I very quickly ran into an issue using this switch, transferring data from a port with ...
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Unable to access Qnap NAS device

I have a Qnap NAS connected to Qnap QSW-M2108-2C managed switch. That switch has one port leading to the internet and another port connected to a MacBook running Qfinder Pro. Everything was working ...
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Update software on 3Com Baseline Switch 2928-SFP Plus

I would like to update my 3Com Baseline Switch 2928-SFP Plus (Device Name: 3CRBSG2893) but can't figure out how to find it on HP's site. The model has been incorporated into HP's line of switches and ...
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About MPLS label range

In most routers or switches that support MPLS, if transit label and uhp LSP label need to have a different label range? when protocol(LDP or BGP) assign labels, I know that VPN label and LSP tunnel ...
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Existence of switch disturbs network: cable is fine straight to laptop but not through a switch

This will be a bit complicated to read, but I hope it will be clear. English is not my first language, sorry. In our school we have an HP 2530-24G switch connected to an unmanaged tp-link tl-sf1005d ...
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Redundant network connections (using switches without link aggregation support)

I need to connect two Windows 10 PCs together via Ethernet. They will be connected in series through two managed switches (Microchip KSZ9897). Each PC has two Intel NICs. I need the links to be ...
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Setting the MTU of a virtual Switch on a qNAP NAS (QTSHero OS)

For a project that I am currently working for, I bought a QNAP NAS (TVS-h1288X). In that project, I have multiple network cameras. On the NAS, I have a Windows 10 VM which is supposed to store all the ...
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Issue with rsyslog creating mutliple log files from a remote cisco switch

So here is our setup Server: rsyslog server - CentOS 7 Client: Cisco Catalyst C6880-X-LE /etc/rsyslog.conf from the CentOS 7 server: $ModLoad imuxsock # provides support for local system logging (e.g....
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When using port monitoring for packet capture, capture machine gets messed up IPv6 addresses

I'm using the "port monitoring" aka "port mirroring" feature of a managed switch to do Wireshark packet captures of network traffic. The traffic I'm monitoring is on a separate sub-...
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How to use more than one port as mirrored port in any Ethernet switch

I want to feed packets from a mirrored (SPAN) port of Ethernet switch to two monitoring devices at the same time, hence both the monitoring devices gets exact same set of packets. I can think of using ...
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How does a switch communication map ip address to Mac address? [closed]

Assuming 10 computers are connected via hub. Pc1 sends data to ip address of pc2. But hub broadcasts it to all computers. Whereas if I replace hub with switch, then switch will maintain table of ...
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Cannot ping two computers with each other on the same switch. (Newbie)

I am an absolute 0 in network science and I would like to understand it a little bit. We have an offline machine connected to a switch, which is also connected to a series of other hardware that ...
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Connecting an SFP+ port to a QSFP28 switch

Background - I am working with a client trying to get a new Dell R540 server onto the client's network. They provided me with a single port on their Cisco Nexus 93240YC-FX2 Switch to connect the ...
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Having one ESXI VM serve DHCP addresses for two VLANs?

In our office, I want to create two different networks. Depending on which LAN socket a cable is plugged in, I want the device to receive an IP in a different subnet. I have a server running VMWare ...
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Brocade version compatibility

I want to add a SAN switch to the existing fabric, the new SAN switch is running on Brocade v9.x the switches in the fabric are running on Brocade v7.x, is it feasible to connect them or should I ...
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Do nodes in a single-switch ethernet network governed by dnsmasq communicate directly, or via the router?

Variations on this question exist, but I cannot be certain my exact situation has been asked. I am setting up a simple ethernet network that looks like this: On Node 0 ("rpi1") I am running ...
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Can I segment my network based on two different criteria?

I work at a school with several campuses and I would like to segment my network with VLANs. So, phones on one vlan, printers on another, etc. I was thinking it would be nice to segment by campus, as ...
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How can i connect OPNsense router to Mikrotik Switch

I've encountered this situation where I'm to access the switch from my router: Here is what i have set: Lan (DHCP 192.168.50.1 , DHCPIPV6) WAN (DHCP 192.168.80.1,DHCPIPV6) Mikrotik (DHCP 192.168.80.1,...
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How to configure IP address to an Huawei AR158E interface?

In my work we saw one old Huawei AR158E router gathering some dust and I'm playing now with it seeing if I can give it some new purpose... So far I have been able to configure some VLANs and a VLANIF ...
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kvm bridges: disable promiscuous mode, is it possible and is it wise?

I am a little confused as to if this is the right question, but I have a number of KVM hosts with multiple bridges on (sometimes)bonded interfaces, and each bridge is mapped to its own distinct VLAN. (...
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Layer 2 Network vs Layer 3 Network [closed]

I am very new to networking world and forgive me if its a lame question - My question is even though network operate using all 7 layers present in OSI model, often I hear people asking is it layer 2 ...
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