All Questions
Tagged with switch networking
48
questions
0
votes
0
answers
10
views
Directing single subnet traffic via multiple VLANs [closed]
I have a setup where I would like to distribute devices connected to a L3 switch in multiple VLANs but I have a DHCP server offering a single subnet to the switch.
I'm attaching a network diagram ...
0
votes
0
answers
17
views
Resetting brocade vdx 6720 password to default without boot password
I want to reset a Brocade VDX 6720-24 switch that i got from ebay to default settings. It has a boot password. Extreme networks can not help with the recovery string because it is past end of life. Is ...
2
votes
3
answers
88
views
Core Switches Redundancy Problem
I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
-1
votes
1
answer
27
views
VLSM Error on Cisco Distribution Switch [duplicate]
I have created 3 VLANS which should not overlap but somehow are giving me overlapping problems. Any reasons why? Is the switch buggy?
VLAN 10 10.1.1.0/28
255.255.255.240 Usable:10.1.1.0 to 10.1.1.15
...
0
votes
0
answers
81
views
End to end delay over N link including the (simplified) propagation delay
It is well know (see this question) and easily verifiable that end-to-end delay in case of trasmission of P packets of size L over N equal links (same transmission rate R) with zero propagation delay ...
1
vote
2
answers
594
views
Brocade 7450 - set MTU to 9000
I have brocade icx 7450.
I already enabled jumbo frames to increase MTU packets on switch.
But unfortunately I am not able to change MTU size of port which I want. When typing after choosing interface ...
0
votes
1
answer
249
views
input discards on Arista 7124SX-F
im seeing input discards on one of our uplink on Arista SW
if i run sh platform fm4000 interface ethernet 22 counters verbose command it is showing smp0DropPkts which is equal to the input discards.
...
0
votes
1
answer
148
views
Noob: i design a network for 156 computers/4 printers, need help in few things
Sorry if this stupid questions: I just learn networking like a week.
Lets say company xyz have 39 computers and 1 printer in each floor, there are 4 floors, total amount of computers is 156computers ...
1
vote
1
answer
208
views
Configuring shared uplink on l3 dell s4128f-on
I have a Dell switch s4128f-on which I'm using as L3 core switch. What I want to achieve is creating multiple vlans and being able to reach other networks through an uplink.
What I've done so far is:
...
1
vote
0
answers
83
views
Port mirroring traffic on Hyper-V not showing Layer 3-7 traffic [closed]
We've been experiencing some issues with port mirroring that is used by a Network Intrusion detection system. Our company uses AlienVault as a SIEM and uses a Hyper-V sensor which is used to forward ...
1
vote
1
answer
4k
views
How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI? [duplicate]
How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI?
5
votes
1
answer
5k
views
Does an unmanaged switch deal with IP addresses at all
My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses.
When computer A on a local network wants to communicate with computer B for example through the ...
0
votes
0
answers
22
views
What is preamble in ethernet frame and why is it used? [duplicate]
I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean?
Also I've seen another definition that preamble gives NIC time to realize a frame is ...
1
vote
1
answer
71
views
How Switch knows if the packet reached it's destination?
In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
1
vote
1
answer
82
views
How do switches handle network data if the destination computer is powered off in half-way?
Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
1
vote
1
answer
240
views
Is it possible to configure Cisco ASR901 as a layer 2 VLAN switch?
I have been fiddling with a Cisco ASR901 for a while now, but I can't wrap my head around configuring it as a layer 2 VLAN switch. Is it not possible to configure one of its Gigabit Ethernet ports as ...
0
votes
2
answers
40
views
Why Ping Reply Succcess from different subnet IPs
In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
0
votes
1
answer
40
views
What is the difference between these two different network security devices?
I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means.
SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
1
vote
1
answer
548
views
How to block telnet access for one particular network from all networks except one using Extended ACL
Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
1
vote
2
answers
1k
views
Do DSLAM and OLT function like a switch?
Let's say for example we have the following hypothetical topology:
In each network, can each user communicate with each other?
For example, can User 1 ping User 2?
1
vote
2
answers
2k
views
How to Change the Date on Cisco Catalyst 3750x Switch
We are using cisco catalyst 3750x 24 port switch series
How to Change the Exact Date(Singapore) on a Switch
ASW-G-L09-001#show running-config
Building configuration...
Current configuration : 11883 ...
0
votes
1
answer
152
views
Linux networking + mix of auto-negotiation of yes/no [closed]
we have 10 servers with Advertised auto-negotiation: yes
as
the machines with driver driver: i40e
driver: i40e
version: 2.3.2-k
firmware-version: 10.51.5
expansion-rom-version:
bus-info: 0000:12:00.0
...
2
votes
1
answer
453
views
Trex not receiving any packets
This is my setup to benchmark my server Diagram
Trex version v2.88
Trex server MAC
ens2f0: f8:f2:1e:5c:bf:78
ens2f1: f8:f2:1e:5c:bf:79
DUT server MAC
eth0: fa:16:3e:1c:be:82
eth1: fa:16:3e:d5:37:b1
...
4
votes
1
answer
199
views
GNS3 switches vs Real switches performance
I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are:
Do emulated switches perform worst than actual switches?
Are emulated ...
1
vote
4
answers
648
views
setting up a VLAN and joining 2 buildings through underground cabling
I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd.
So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
1
vote
1
answer
6k
views
Switch doesn't learn MAC of a connected device
I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
0
votes
1
answer
68
views
What is the difference in packet structure for tag VLAN and port VLAN
I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
0
votes
1
answer
4k
views
Connecting a 10 Gig server to a 1 Gig switch
Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow:
4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port)
However, we are trying to see if ...
6
votes
2
answers
3k
views
Can a single subnet work across several switches?
New to networking and studying hard but limited access to a kit to try things at the moment...
My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
0
votes
1
answer
56
views
Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?
I can query a interface detail:
admin@Juniper-EX# run show interfaces ge-0/0/1 detail
Physical interface: ge-0/0/1, Enabled, Physical link is Down
Interface index: 131, SNMP ifIndex: 504, ...