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

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0answers
18 views

I work in a school we have a classroom setup using a TP-LINK switch if the internet connection goes down I am not able to see the other machines [on hold]

The lab has the TL SG1048 switch and 28 machines (I did not setup the network) if our internet goes down I am not able to see any of the local machines, my understanding of a LAN (I used to work on ...
-1
votes
0answers
33 views

How to determine optimal fiber cable length?

We are going to send several servers for colo in a datacenter where we got 20U space (half a cabinet). Our configuration includes 1x4U, 1x2U and 1x1U servers and 1U for a switch. They'll all be ...
0
votes
0answers
13 views

Can I reset and access a Netgear GSM7532S without a serial cable?

I've recently been given a GSM7532S switch, however, I don't have any equipment with a serial port or have a serial cable. This device appears to have a web interface available but attempting to ...
0
votes
0answers
23 views

How to use SNMP to read all the 802.11 probe request messages on an accesspoint [on hold]

each Wi-fi clients send probe request to all access points around. I want to programmatically read all 802.11 probe request messages on each an access point in our building. How to use SNMP from any ...
0
votes
1answer
28 views

Networking related

I created two Vlans in a switch: Vlan 2 and 4. I want to access these two vlans in my computer without help of L3 switches. For this purpose I created port 24 as a trunk and directly connected to it ...
0
votes
1answer
25 views

Intervlan routing--DHCP offer from server on default VLAN not making it back to newly created vlan via layer 3 switch

Default VLAN: 10.36.0.0/24 New VLAN : 10.36.8.0/24 DHCP server : 10.36.0.17 I can see the DHCP offer packets making it back to my VLAN ip address namely 10.36.8.31 (from dhcp server message log) ...
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votes
0answers
16 views

Will this setup cause a Bottleneck Connection / Speed issues? [migrated]

I'll have one cat6 cable running from my router to a switch. That switch will then give internet and network access to 5+ devices. Will this cause a bottleneck / anything negative if all devices are ...
-1
votes
1answer
42 views

Point of Sale Terminal Crashing the Network

We look after a series of restaurants which is a collection of point of sale terminals and a typically a single workstation per site. We have one site that is causing a fair amount of head ache and ...
0
votes
1answer
34 views

Set a upper bandwidth limit for Infiniband HCAs

I have to deal with PCIe congestion and I need to find a way to reduce PCIe traffic. I get several IB cards in one node (among other PCIe devices). HCAs are FDR Infiniband. Putting those HCAs in ...
1
vote
0answers
15 views

How should I use Cisco ASA 5510 and Catalyst 3550 together

So I took on a project at my job moving four separate networks into one Colo center. Currently I broken everything down from the four networks into 4 VLANS on the ASA 5510. Each are assigned IPs ...
0
votes
3answers
47 views

Configure small LAN to WAN network

I want to setup a small LAN that can connect to Internet via my ISP's router (I have only one open port on my ISP's router and 6 public IPs). On my side, I have an Ubiquity Router that I connect to ...
0
votes
0answers
14 views

How to make D-LINK switch IP permanent

I have procured a new D-Link Switch. I have changed its default ip address from 10.90.90.90 to a new ip address. eg - 192.168.100.101. But I am unable set the ip permanently. Whenever I power off the ...
-1
votes
0answers
18 views

Cannot ssh from host to guest os in Virtual Box [migrated]

I have a windows machine with virtual box installed. I have ubuntu VM within the virtual box. If I setup my vm's network to use NAT, and setup port forwarding to forward from my localhost to the ...
-2
votes
2answers
54 views

connecting two switches with different ip ranges

I have two switches that assign different DHCP IP addresses. one assigns 192.168.0.x to devices that are connected to it and the other one assigns 10.0.0.x ip addresses. Is this the reason I cannot ...
-1
votes
1answer
32 views

How are IP packets routed from LAN to WAN? [closed]

I have OpenWRT set up on a router, with a wireless client connected on the LAN, and connected to another network on the WAN. wlan1 is bridged on the br-lan interface, and typically forwards to the LAN ...
1
vote
2answers
55 views

VLAN sending data to ports it shouldnt have to

I noticed (based on activity lights) that VLAN traffic between two switch ports are being sent to many switch ports. Here's my scenario: Port 1 is a "mode access" switchport for VLAN 100 (untagged ...
1
vote
0answers
22 views

Configure Cisco QoS for VLAN

I have two VLANs (20 and 21) that are accessing the same resource on a switch. Clients on VLAN 20 access this resource only at schedule times, but when they do, they generate lots of traffic as ...
-1
votes
1answer
34 views

Netgear Switches GS748Tv4 and v5 ports go down and up and Spanning Tree Topology Change

I'm getting notifications on my Syslog server from the Netgear switches GS748Tv4 and v5. These are the notifications: traputil.c(696) 122305 %% Link Down: g30 ...
1
vote
0answers
76 views

Zabbix drops in SNMP from Cisco SG200 switch

I'm using Zabbix 3.0 to monitor our main switch in which the port from the firewall as well as other ports show what appear to be drops of either sending or receiving. One would conclude that if this ...
0
votes
1answer
32 views

Extreme Switch QinQ

Trying to configure QinQ solution between two extreme switches facing an issue: | Error: 8: Port cannot belong to VLAN and a VMAN at the same time.| This port is not configured in any VLAN or VMAN ...
1
vote
3answers
42 views

Network adapter only works with ethernet switch

I have a Dell XPS13(Win 10 Pro) and since we dont have wireless lan in the office i had to buy an external ethernet adapter (DA200). The adapter works perfectly fine at home but it doesnt work at all ...
1
vote
0answers
33 views

When a computer wants to send a IP packet to another computer in the same network, how does it know the destinamion MAC address of that host? [closed]

So I know that switches are better than hubs because they can forward an Ethernet frame exactly to the host that has that specific destination MAC address. However, when two computers communicate, ...
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votes
1answer
48 views

ZyXEL switch management port configuration [closed]

I'm a total newbie in configuring a network switch and I would like to know how can I configure the management port of a ZyXEL switch. I have a ZyXEL XGS3700-24 model and I set an IP address like ...
0
votes
0answers
16 views

PCIexpress switch mixed gen2/gen3 behavior

For a PCIexpress switch with a physical gen3 x4 upstream, and two downstream devices each with x4, what is the expected speed/performance behavior when Downstream device 1 is gen2 x4 and downstream ...
0
votes
1answer
41 views

Subnetting/Supernetting Configuration

I have an existing network. It looks like this. Router LAN (192.168.0.1 /24) -> Switch (192.168.0.10 /24) -> Workstations (192.168.0.100 - 192.168.0.200 /24) Our network has expanded and I need to ...
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votes
1answer
33 views

switch and local ip's [closed]

ive read in other topics that switches doesn't understand IP and they only use MAC addresses i have a lot of NAS and 4 computers on my network. I'm planning to buy a switch to replace a router that i ...
0
votes
1answer
27 views

802.1Q and Network Security

I've recently purchased some TP-Link managed switches (two TL-SG1016DE and one TL-SG105E). I purchased the two first and set it up using 802.1Q VLANs to segregate my DMZ and my LAN, using ...
0
votes
0answers
7 views

Can't connect to the IBM bladcenter switch

I got IBM 8677 bladecenter with hs21 type 8853 & 7995 I connect the Ethernet SM I\O module , configed it in the IMM to same subnet as my host. I dont know why , but I cant telnet it or ping it . ...
0
votes
0answers
42 views

DHCP option 43 on switch Dell PowerConnect 5500

I have Dell PowerConnect 5524. Put SW01(config-dhcp)# option 43 hex f104ac1338fa got Option code 43 is not a valid HEX string. Strange. Its worked ok for me on Cisco device. Looking at User ...
0
votes
0answers
41 views

How to use SNMP to get port state of all VLAN in Cisco switch

I am working on using SNMP to get the state of the port of a spanning tree. I used OID .1.3.6.1.2.1.17.2.15.1.3 and it returned the state of the port. e.g. C:\Users\imuntol>snmpwalk -v 2c -c test ...
0
votes
1answer
105 views

Expect script too fast: add a sleep between each line read from a file

I am trying to automate switch commands. It's almost all good, but when the expect script reads each line from the file containing my switch commands (listed line by line), the switch seems to stop ...
1
vote
1answer
84 views

Port Security / MAC lock with Netgear GS752TXS

Has anybody here has in use the Netgear GS752TXS (52 Port Stackable Smart Switch with 10GE uplink) with port security active? I would like to activate port security on specific ports to allow only ...
-1
votes
1answer
42 views

HP ProCurve 2920, MAC filter

I have few HP 2920. They are connected to another HP modular switch via uplinks. When I check which devices are connected via MAC I can only see MAC addresses on uplink ports (idk why I can't see ...
0
votes
0answers
25 views

cannot connect to switch

I've been out today and bought a USB to serial cable and I was going to get a female to female db9 (rs232) but they advised I get a gender changer (female both ends). However when attempting to use ...
0
votes
0answers
16 views

Is it possible to monitor all 24 switch ports on a span port? (for snort / NIDS monitoring)

This isn't possible on the switch we have now (you can monitor at most 4 ports in full duplex, or 8 ports in half-duplex). I'm wondering if there is hardware out there that allows you to monitor all ...
0
votes
0answers
13 views

Virtual Switch Stack connections to Edge Network

I have a pair of Cisco SG500 switches stacked together as a part of my collapsed core design. I would like to connect this stack to the edge network which is comprised of two Dell Firewall/SonicWall ...
2
votes
2answers
51 views

Is a switch is an iSCSI “mode” required for iSCSI targets?

If I have a switch, nothing special set up, just regular traffic, no jumbo frames, no special iSCSI set up, can I still have iSCSI traffic, say from a Windows machine using the iSCSI initiator and a ...
1
vote
1answer
49 views

Manage Windows Server 2012 and trunk the Hyper-V VM (same physical NIC)

I'm trying to use Hyper-V to deploy a pfSENSE box inside of it. But, the scenario is: 3 VLANs VID: 1000 VID: 2000 VID: 3000 On a physical switch port, I've tagged the Server physical port with ...
0
votes
0answers
33 views

Network layout advice needed

I have been doing some research, I keep reading about source guard on Cisco for segregating subnets and only allowing certain ports access to an IP Address range. However, I don't use Cisco switches, ...
3
votes
3answers
271 views

How to recover from switch failure? [closed]

Suppose there is only one switch within a system and it is connected to a bunch of machines to form a network. If this switch goes down, the entire network goes down. Chances of this happening are ...
0
votes
1answer
35 views

HP 2530: multiple management IP Addresses possible?

I have two HP 2530 switches in our hosting center. Because of some VPN problems between our office and the HC, i need to change their management IP Addresses to a different IP network. Currently they ...
0
votes
1answer
45 views

Forwarding IPs to Switch for NAT

I have a Question. We actually have a Cisco 1812 Router and we're Switching to an ASA 5512-X. The Problem is, the ASA 5512-X only has 6 Ports. The 1812, had 8. All in use. We need to translate 3 ...
1
vote
2answers
54 views

Live Migration - Switch Infrastructure

We will be deploying into an environment intended for maximum resilience/redundancy and the capability for rapid scalability. Context This environment is: 1 x NAS server with FreeNAS RAID 2 x ...
2
votes
0answers
21 views

Cisco Switch Routing performance monitoring

It is quite a question for me: I have Cisco Catalyst 2960S switch which is nice hardware even despite its age and EOL. I'd like to set it as small router between several networks within a remote ...
0
votes
0answers
54 views

Problems with Switch DGS-3420-26SC

I have a new SWITCH DGS-3420-26SC. Look at situation: On the first SWITCH Dlink DGS-3100-24TG, i have three VLANS: VID 99,132,100 99 this is our SERVICE VLAN; 100 this is VLAN of the neighbours ...
14
votes
2answers
1k views

Virtualization - Ten 1Gbps links or one 10Gbps link? (Performance)

I have a machine that has several VM's (5) and 3 physical networking cards (with each 2 ports), with a total of six 1Gbps ethernet ports. I have a SPF-capable switch, having a total of 48Gbps ...
0
votes
0answers
83 views

Difference between VPI and VCI in ATM

I don't really understand the difference, neither the necessity of including two fields (VCI and VPI) in asynchronous transfer mode. As far as I understand the main difference between a virtual path ...
1
vote
1answer
53 views

DHCP Server Port-Based Address Allocation on Cisco switch 2960-x

I am trying to configure DHCP Server on a Cisco 2960-X switch to achieve port-based address allocation. I would like the IP address assigned to any device connected to that port to be the same every ...
0
votes
0answers
15 views

Limiting internet subscriber's bandwidth on L2 vs L3

From my perspective, I see at least three ways of doing that: Limiting CIR/PIR per port in distribution: switches, GPON OLTs (L2) Limiting at router with simple HTB/PCQ queues (L3) Combination of ...
1
vote
1answer
66 views

Replace client switches with Netgear to match core or instead mix/match Cisco?

We are looking for how we can have a more reliable, simpler network. How can we keep out administrative burden low, and work smarter not harder when it comes to our infrastructure? Background: We ...