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Questions tagged [switch]

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

Switches (in the context of this site) are devices with multiple network ports, which allow interaction between all devices connected to these ports.

Basic switches operate at the data link layer level (in TCP/IP networks) and forward packets based on the link layer address in the packet headers. They are different to hubs in the way that hubs generally broadcast incoming packets to all other ports, whereas switches keep tables of link layer addresses they have seen at specific ports and only forward packets to the relevant ports. Basic switches are also known as layer 2 devices.

Higher grade switches can include functionality at higher layers of the OSI stack. This can range from IGMP snooping (for multicast support) and VLANs through to NAT, VPN, firewalls or even application layer functionality (web caching or proxying). Such switches are known as multilayer devices.

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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-forwarded-for information http header(http header…
daniel
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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 issues. What SW tools can I use on Windows or Linux to…
jackhab
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How to isolate devices on a subnetwork?

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 measurement system located on the roof of the…
nowox
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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=privilegedUser,OU=User,DC=company,DC=com Using a global…
Medera
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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 the timezone and the summer-time in my switch…
B3ne
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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 and forth to and from each other. Slower networks…
herbey zepeda
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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 possible, with these features, to ensure that a…
Lunde
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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 me? I have two Ubiquiti EdgeSwitch PoE switches…
codlord
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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 a managed layer 2 switch. The switch has multiple…
Lunde
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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…
ABarghati
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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. via logger command) $ModLoad imjournal #…
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How does a switch communication map ip address to Mac address?

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 switch plug and Mac address. When PC1 sends data to…
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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 control various motors and sensors. In this offline…
lexax127
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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 server to. The server has two 10GE SFP+ ports and we…
Jacob D
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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 ESXI. On the server, Windows Server is running in a…
jdm
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