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

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Querying counters and interface name from cisco router is getting wrong results

using cisco switches, I am trying to connect the output from ifHCInOctets to the names of the interfaces via ifName and comparing it to show interfaces counter. I use the last number behind the ...
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1answer
23 views

Debugging dropped UDP messages on Linux

Here's my setup: I have 1 host that has a 1 Gbit Ethernet connection and 2 hosts with 100 mbit connections (connected to the 1Gbit host through different switches). In a test, I send 1000 1kb ...
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1answer
19 views

cisco 3850 in separate wiring closets - VSS?

I have two new 3850 24 port gig switches. I am putting one in the front wiring closet of our warehouse, the other in the rear. IS there a way to have these be a layer 2 / layer 3 Virtual Switch using ...
1
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1answer
37 views

Procurve Inter VLAN Routing

I have a VLAN routing issue on our network. We have two ProCurve 5406zl's being used as our core switches, each vlan on these switches has an IP address and VRRP is configured on each vlan for ...
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3answers
49 views

Why another PC on lan can ping me even when I use /30 subnet?

Here is the set up: PC A : IP address : 192.168.1.2 Netmask : 255.255.255.252 Gateway: 192.168.1.1 PC B : IP address : 192.168.1.220 Netmask : 255.255.255.0 Gateway: 192.168.1.1 PC B is able to ...
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0answers
53 views

2 VLANs between four switches

I am having a problem that I do not quite understand with my network setup. I have four switches on the network: Switch A is a managed network switch which is connected to the PC router -- it is set ...
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1answer
24 views

LACP - Load Balancing Network 2Gbit Ubuntu

I have configured my server as bonding interface to achieve 2Gbit network speed but it seems ubuntu can not go over than 1gbit and the outgoing traffic from server is not balanced over 2 interfaces. ...
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1answer
16 views

Cannot access D-Link DES 3200-10 after resetting account

I've forgot my password and after googling I've found that in recovery mode I can reset my account. Connected to Switch using console port (VT100+ Keyboard compatible) and pressed Shift+6. I accessed ...
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0answers
22 views

More Management VLANS for a switch

I created a management interface in vlan 99 to telnet the switch (2900 series). I also wanted to configure another management interface for the same switch from the computer belongs to the different ...
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3answers
51 views

Connectivity between switches using SFP+

My office infrastructure is currently configured with HP Procurve switches. They are interconnected with 10Gbps fibre. All the SFP+ Ports are in use on all the switches. I am looking at buying a new ...
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0answers
33 views

VLANs with mixed MTUs trunked over a LAG

I'm contemplating enabling Jumbo frames for a specific network/VLAN (a dedicated storage network). Ports are spread across two switches, linked together using a LAG, which is configured to carry all ...
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7 views

Ceph Cluster Switch Specifications [duplicate]

What's more important when building a 10GbE Ceph cluster - switches that have larger buffers or switches that have less latency?
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1answer
25 views

frequent delay of 5-10 sec in sending commands from putty redhat. Why?

When we type a command from putty, it suddenly hangs for a period of 5-10 sec or more, but the commands are sent to terminal later. So seems to be a latency which occurs frequently. But, I might be ...
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1answer
32 views

Set Internet Access for VLAN + Default Gateway + DHCP Client

I have a question that make my mind so bussy. I would appreciate if anyone guide me about this. So let me explain: Firstly consider We have bellow devices: Devices: 2 L2 Managable Swiches 1 ...
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0answers
21 views

Can't reach centos server after “Multicast listener report” IPV6

I ran into a problem that occurs only on a few servers. Every 5-6 minutes I lose connection to the server, and it get backs after a few minutes. In most cases it's a VM that is not reachable while ...
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0answers
17 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 ...
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1answer
30 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 ...
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1answer
36 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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1answer
52 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 ...
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1answer
38 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 FDR-...
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0answers
23 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 ...
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3answers
67 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 ...
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15 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 ...
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2answers
67 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 ...
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1answer
36 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 ...
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2answers
62 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 ...
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0answers
30 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 they'...
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1answer
50 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 traputil....
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0answers
153 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 ...
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1answer
44 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
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3answers
48 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 ...
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42 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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1answer
130 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 192....
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20 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 ...
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1answer
55 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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1answer
34 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 ...
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1answer
35 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 tagged/...
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0answers
9 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 . ...
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50 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 ...
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49 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 192....
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1answer
166 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 ...
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1answer
102 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 ...
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votes
1answer
55 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 ...
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0answers
27 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 ...
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0answers
17 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 ...
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0answers
17 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 ...
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2answers
53 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 ...
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1answer
74 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 ...
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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
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3answers
280 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 ...