Questions tagged [switch]

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

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60 views

Configuring 3 VLAN with different IP ranges?

I bought TP-Link T2500G-10TS L2 switch. My intention is to establish 3 VLANs. Company A - IP range starts from 192.168.1.1 to 255 Company B - IP range starts from 192.168.2.1 to 255 Guest - IP range ...
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32 views

In the STP root bridge election process, how do switches advertise themselves as the root bridge if all of the ports start in the blocking state?

In the STP root bridge election process, all of the switches advertise themselves as the root bridge until they receive a superior BPDU. Every source about STP says that after initialisation all of ...
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Rsyslog unable to receive syslogs from two or more switches , error in rsyslog configuration file

I am trying to send syslogs from routers/switches in a production environment to a linux server which has Rsyslog installed on it. Its working fine as long as rsyslog config file is set to receive ...
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22 views

Hp switch - enable promiscuous interface but prevent possibile attack

i'm facing a strange request my client have done to me and i would like some help. He ask me to put a probe in promiscuous mode in my ced between my network and the mpls than connect us and them for ...
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43 views

Connection Two sites

My office is moving and the big concern is about networking. The move will take two months but they need both sides to be operational during that time. The big challenge is our old PBX. Do they need ...
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74 views

VLAN - Network Redundancy With Same 2nd Switch?

Is it possible to set up the same VLANs on two different switches with same IPs, but different MACs on dual port network cards of servers? In case switch 1 is down or needs maintenance I would like ...
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1answer
47 views

how to configure static lan ip to different router provided by isp?

We have got Vodafone Internet ISP. We asked for 5 public ip's. They had provided 1 wan ip and 5 lan ip pool. WAN Configured and internet working but LAN ip how to use, i need 5 static ip address to ...
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33 views

Can I plug PoE injector between UPSed PoE switch and device to prevent it from drawing power from UPS during outage?

I have Linksys LGS116P which is 8 normal + 8 PoE Gbit switch. I am powering 5 cameras and 3 access points from it. Remaining 8 non-PoE ports are already used. Switch is plugged into UPS to keep ...
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36 views

Attempting to drop packets to simulate a network failure

I have a switch running Linux with multiple devices on it. I'm attempting to simulate a network outage on one of the devices. I've attempted to drop the packets with both netem and iptables using ...
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2answers
69 views

Static Routing Server Rack

I am currently installing a server rack for a customer, and they've asked a qauestion. They want/need to optimise U space as to avoid paying overheads for U's that aren't needed. The question they've ...
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14 views

Extreme Networks MLAG and three locations

I have three locations A,B,C each contain one pair of switches x620 stacked using MLAG. i want to connect them using 2 links like this: stack1 stack2 stack3 [A1] --- [B1] --- [C1] [A2] --- [B2] -...
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142 views

Linux server as an unmanaged switch

I have a small Ubuntu x64 server, which provides dhcp, naming, file and such services to my home network. It's simply connected to unmanaged SOHO switch laying next to it and just works. But, it has ...
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37 views

Cascading Dell network switch with other brand: Network failure

I came up this puzzling issue today. Within the rack there is a Vigor3900 router connected to a 48port Dell switch. I cascaded it to a 24port unmanaged TP link one since we needed to cater for about ...
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49 views

Use VM as a router for another VM

Hi all I need some VM routing help please. I have two VMs running in VMWare Workstation; Kali Linux (172.16.20.106) & Windows 10 (172.16.20.107). Kali has a bridged (internet) & a host-only ...
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36 views

How to change cisco 3750 specific port MTU to 9000?

How to change cisco 3750 specific port MTU to 9000? I do not want to set it as a system global command for all ports.
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102 views

SNMP Network traffic difference between ifInOctet and ifHCInOctet

I try to monitor some Cisco 2960x Switch devices and I know there are the SNMP OID's ifInOctets (32-bit Counter) and ifHCinOctets (64-bit Counter). Can someone explain me whats the difference between ...
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72 views

Configure NICs as a switch in ESXi

ESXi 6.7u3, my host has 6 nics, I use one for connection to the network but i want to configure the remaining as a normal dumb switch, help needed. It seems that this should be rather straight ...
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223 views

How do I set up multiple interfaces on Windows Server 2019?

I am working on setting up a small vm host cluster and I have the following setup : Windows server with multiple network interfaces Aruba 2930f switch Switch is connected to internet (gateway 192.168....
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280 views

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 ...
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125 views

HP ComWare - Detecting mac/hardware address of CONNECTED interface

Alright, so I'm adding an IRF member to our switch stack. They are 5130's, JG937A. Only problem is the IRF cables are BURIED in the rack channel (I mean buried buried), and there's no way for me to ...
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2answers
299 views

IRF (stacking) Configuration on HP Comware switches (5130's)

I currently have a stack of 6 HP 5130's and would like to add another switch to that IRF stack. I have everything on the same firmware, etc. but I'm confused as to when to enter the configurations on ...
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36 views

LAN cable-tester's LEDs fire at 3 and 6 (without passive side attached)

I have hardware question. I am running a duplex CAT7 cable from a patch panel to a wall socket. One connection works, the other struggles when I test the cable. Below I describe how I tested the cable ...
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How to identify Cisco C3850 switch in /dev/serial/by-id

We have several Cisco C3850 switches connected via USB to a centos deployment server and want to reliably deploy configuration to each of them, which we thought we could do by using tftp to pull ...
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88 views

Connect two switches with two VLANs each

I have two switches (A and B), each one divided into two "Sub-switches", i.e. two VLANs. Port 1 to 12: VLAN 100 (untagged) Port 13 to 24: VLAN 200 (untagged) Now, I want to connect the ...
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50 views

Remotely click Power button for equipments after blackout

I am wondering on what improvements to make to our server room, as to we won't be in the office for quite a while because of COVID. I want something like an auto clicker (physical device) that I can ...
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111 views

Cisco 2960 reload without rebooting

I have a Cisco 2960X (48) with a weird behavior. I keep seeing alerts from my nagios telling me that the "site" is DOWN, then UP. It happens almost 10 times a day. It looks like the switch ...
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28 views

ip addresses on Vlan

I have a question maybe a dumb one but I got just started exploring VLAN's. I got a vlan and I need to give it a IP address and I have two switches. Can the IP addresses on the different switches be ...
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54 views

Linux networking + mix of auto-negotiation of yes/no

we have 10 servers with Advertised auto-negotiation: yes as Supported ports: [ FIBRE ] Supported link modes: 10000baseSR/Full Supported pause frame use: Symmetric Supports auto-negotiation: Yes ...
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1answer
878 views

Why are untagged VLANs configured separately from the port PVID?

After misconfiguring a switch port yesterday, I'm curious: in what situation would you configure an untagged VLAN on a switch port and not set the PVID to that same vlan? On all the switches I've ...
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250 views

Radius Authentication error between Active Directory NPS - Aruba 2930f

I am trying to configure Radius authentification using NPS backend. I have configured both ends but it does not seem to work.I am not sure if this is even correct. Kindly help. NPS Config: I have ...
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Is it possible to assign an IP to a tagged dual-mode port (Brocade)

I have a router (ubiquity USG) and a Brocade FCX648 Layer 3 switch. (I have a second one in a stack, but that's unrelated). The end goal is to be able to connect the switch to my router, provide IPs ...
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106 views

choose between multiple pppoe servers connected to the same switch

I have a big 48ports managed switch, on this switch there are connected two ONT/PON zyxel adapters over their eth port, each one is equipped with 1 / 500 Gbs fiber connectivity of the same ISP and two ...
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73 views

D-Link DGS-1210-28 factory reset

Have a problem with D-Link dgs-1210-28. Can't get into web interface after reset. I'm holding reset button about 20 sec (until power indicator blinking). After that I'm able to ping default switch IP -...
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1answer
146 views

How do you determine which HP switch firmware is most appropriate?

We have a few HP 3810M switches, and I know the firmware is not up-to-date. However, when looking at the firmware list there are several different "current" versions. For instance, all ...
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57 views

how to change the uplink LAG mode?

I have Dell EMC PowerEdge FX2 with 4 uplink ports which are working by LAG mode. I'd like to have 2 or 4 independent uplink ports which will be working independently. FullSwitch is good enough I ...
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35 views

How to access a host on 192.0.2.0/24 from Linux?

I've got my hands on the FSM-510G switch that has a default IP set to 192.0.2.1. It's obviously not in the LAN CIDR block, so what should I do on a Linux host to be able to access it directly? The ...
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1answer
46 views

Fiber to copper switching - small network requiring robust solution

I have a simple setup which appears to require a clever solution; hoping someone has some ideas. Network: 4 data generating computers, each with a copper->fiber media converter 2 data analyzing ...
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221 views

PSExec Switch explanation

Say you are logged in as user1 and Use PSExec on computer1 and tell it to execute cmd.exe with the -s and -e switch. Would that be an interactive or network login for the source and remote machine? ...
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96 views

Traffic not traversing VLAN over multiple hops?

I am configuring a new Cisco edge switch stack, and temporarily I am trunking this stack through another edge switch back to my core switch (no spare fiber pairs to use to trunk directly). This is ...
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33 views

Layer 3 Interfaces on Cisco Catalyst 2960-C

I am working with a Cisco Catalyst 2960-C, and I can't see equivalent configurations to apply layer 3 interfaces. The switch is configured for routing and does routing. On a Cisco SG 300 Series, I am ...
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186 views

ESXi switch issue with OPNSense

I've got an issue with configuration of 6 port ESXi. I read ESXI single vSwitch with 2 physical NICS and that does not really resolve my issues. I just can't get this configuration below to work. I've ...
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17 views

Routing on multiple adapters and switches

I’ve two router in office with two different switches. first one in internet and it’s sharing through a switch between clients (every pc has 2 network adapters) the second one is a special MAN network ...
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1answer
737 views

How can I Change Password of Cisco (C3560-IPBASEK9-M) Switch with Command Line?

I can make remote (ssh) connection to my Cisco (C3560-IPBASEK9-M) switch on putty and I can log in with username and password. How can I change password -that I use when I log in- on this command line?...
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1answer
55 views

How to properly add more lan devices ? Home network

I have a small home network. 1 router with wifi and 4 lan ports. The problem is that I don't have enough lan ports and I want to extend it. I have a few possible solutions but I feel like none of them ...
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25 views

Multicast Connection within the same Vlan

I'm trying to resolve a multicast connection issue with my system. I have been solely focused on looking at the configuration of my primary switch. I have another working multicast configuration in my ...
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926 views

Unable to get link lights on Chelsio T520-SO using SFP+

I'm new to working with fiber so please bear with me. I've got a Dell R520 that I've just installed a Chelsio T520-SO fiber adapter into. The server is running Ubuntu 18. I've got a compatible Chelsio ...
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19 views

Virtuelle Switches on Hyper-V

I have a test environment in which I want to simulate 3 locations with their own DC but the same domain. All 3 locations have their own subnet, say (x.x.1.x & x.x.2.x & x.x.3.x). I have ...
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1answer
44 views

Can't get connection over fiber run

Between two server rooms on an office campus I have three pairs of fiber with an interconnect panel in the middle. Two of the three pairs were connected before I started here and are working. I ...
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1answer
49 views

how to expand network to another floor

I have a small business on the ground floor of a commercial building. We are planning to rent the 4th floor in this building too, so I need to extend our network to the 4th floor. Presently, here on ...
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2answers
84 views

how to connect reverse proxy Server [closed]

I have an IIS-ARR LoadBalancing server connected to internet. And I have 2 IIS web servers in a LAN (using a switch) without internet. The IIS-ARR is configured as reverse proxy for 2 websites www....

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