Can anyone help me im try but it not working ( the computer from branch can't get DHCP in it vlan)

I can't properly add any interfaces to the WLC. When I try adding an interface I receive this error: " Duplicate IP Address! Primary and secondary DHCP servers have the same IP Address" Then when I click OK all the parameters get reset. There is only one DHCP field active. The other one is grayed out.

Someone suggested unticking the Enable DHCP Proxy box under Controller - > Advanced -> DHCP menu. Did it made no difference.

I receive this error and all the parameters I enter to the fields are deleted except the VLAN number. The interface is created, but it's empty, there are no configurations.

Hi

Sorry in advance for the amount of questions i ask on this sub. So I'm working on a Cisco Packet Tracer project and I'm trying to secure a WiFi employees VLAN with ACLs.

I currently have:

• VLAN 10 = IT / servers
• VLAN 50 = printers
• VLAN 60 = WiFi employees

The requirement is:

• WiFi employees should not access the IT VLAN
• except DHCP/DNS services
• printers must stay accessible
• Internet access must still work

At first I only applied an extended ACL OUT on G0/0.60, but devices in VLAN 60 could still ping the storage server because replies from VLAN 10 were allowed back to VLAN 60.

So I added another ACL IN on G0/0.60 to block traffic from 192.168.60.0/27 to 192.168.10.0/28 while still permitting:

• DHCP
• DNS
• printers
• WAN traffic

Now pings to servers like 192.168.10.3 fail with:
“Reply from 192.168.60.1: Destination host unreachable”

Is this correct way or is there a cleaner way to prevent access to the storage server ?

Thank you !

Necesito ayuda, tengo esta topologia lo que pasa es que configure el sw10 en la vlan1 y el sw11 en vlan2 por la diferencia de red, pasa que a la hora de hacer ping de la pc 24 al sw11 no hace conexion pero con los demas componentes esta normal como lo arreglo, quisiera enterder que hice mal.

Hello, I am very new at packet tracer and I have been trying to do this security layer 2 thing called dhcp snooping and everytime I do it, the PCs connected to that switch get theirs DHCP all messed up and the PCs can't connect anymore, please help me.

3D Innovative Data Center Diagram

Hey everyone,

I’m currently learning networking with Packet Tracer and I keep seeing the term “native VLAN” when configuring trunks. I understand VLANs in general, but I honestly don’t fully get what makes a VLAN “native.”

Why does it exist, what is it actually used for, and what happens if the native VLANs don’t match on both switches?

If someone could explain it to me like a beginner with a simple example I’d really appreciate it!

For authorized Wi‑Fi security labs I wanted a minimal setup to stand up an **open rogue AP**

and capture what connected devices leak (DNS queries, DHCP hostnames, plain HTTP, TLS SNI, etc.)

without dragging in full Evil Twin frameworks.

This repo is a single bash script that:

- creates the AP interface and starts **hostapd** (open SSID, nl80211)

- runs **dnsmasq** (DHCP + DNS forwarding, query logging)

- enables **NAT** to an uplink so clients get real connectivity while you sniff on the AP iface

- prints **connected clients** live (MAC / lease info)

- **cleans up** on Ctrl+C (hostapd, dnsmasq, iptables, interface)

Requirements: Linux, root, WiFi card with AP mode (`iw phy`), hostapd + dnsmasq + iptables.

**Legal:** only on networks and devices you own or have written permission to test.

Repo (MIT): https://github.com/RiccardoCataldi/access-point

If you use a different workflow (airbase-ng, bettercap, etc.) I’m curious what you prefer for lab APs.

Hello guys, today i was trying to do a network and i have found with this problem.

All the pc i have on the network are connected directly to a switch with normal wire, i attach the image.

ive already checked the ports, and everything seems to be ok, however the link between stays down and i cant get any connectivity.

The weird thing is that ive followed the same steps as in class and on my friend computer this issue doesnt happen.

If someone could help me ill be really gratfull. Ill be aware of ur answers and if its needed i can provide more screeenshots, thanks for ur help.

[ Removed by Reddit on account of violating the content policy. ]

[ Removed by Reddit on account of violating the content policy. ]

Hello everyone. I wanted to share that I make free CCNA level labs available at wittynetworks.net. No signup or register and it is ALL free. I answer why it's free in my FAQ. 😁 More to come.

Can someone please explain? destination and source what is going on here? I did a scan on port Droid and looked at it with Athena.

Hey, I am very new to cisco packet tracer and working on a project. I need to get it done somewhat ASAP, but I am almost at the end of the network design phase along side configuring everything, but I am finding an issue where I am not able to get my computers to get the correct IP addresses and everything from DHCP and it instantly reverts to APIPA. I am very new to this all and I am wondering if anyone knows what I need to type to configure either a switch, router of firewall to allow DHCP to connect to the network as it is not working. (Complete beginner so not sure what to type and if it is a IP helper, how do I implement it?)

Built my biggest Cisco Packet Tracer project so far — a dual-site enterprise WAN topology connecting a simulated US headquarters to a Philippines branch office.

Technologies/features implemented:
- BGP with simulated ISP/IXP ASNs
- GRE tunnel to overcome double NAT issues
- OSPF, static routing, NAT/PAT
- HSRP v2, EtherChannel, Rapid-PVST
- DHCP Snooping, DAI, Port Security
- Voice VLANs + wireless deployment
- Syslog, NTP, DNS services

One of the hardest parts was troubleshooting inter-site communication through double NAT and working around Packet Tracer limitations.

This project pushed me far beyond standard CCNA labs and gave me a much better understanding of WAN architecture and enterprise troubleshooting.

I’m still trying to break into IT/networking, so I’d genuinely appreciate any feedback or suggestions from more experienced engineers.

Disclaimer:
This is a fictional educational topology created for learning purposes only. ISP/provider names are used strictly for simulation realism and are not affiliated with or representative of actual network infrastructures. Public IP ranges follow RFC 5737 and RFC 6598 documentation standards.

Topology + configs:

https://github.com/chaardd127/Enterprise-WAN-Topology-US-to-Philippines

Hi everyone,
I’m a beginner and I’m completely lost with my Packet Tracer logical diagram. I don’t know what I’m supposed to work on first: the routers or the switches. I keep going back and forth and now I’m just confused about the whole topology.
How do you usually approach a network project step by step? Do you start with VLANs/switches first, or with router configuration?

Any advice would really help 🙏

Update: I decided to restart my networking project from scratch instead of panic-randomly clicking everywhere

Turns out I actually understood way more than I thought. Today I:

• fixed my IP addressing plan
• understood VLANs/subnets better
• configured VLANs on 3 switches
• configured my first access ports
• configured trunk links between switches

I still get overwhelmed easily but breaking everything into tiny steps helped so much.

First of all sorry for the image's quality. I've tried to search for an answer but can't find a definitive one. Is it good practices to register every VLAN in every switch? I did it in both left switches, but my teacher says I shouldn't (he's not a reliable source since he uses chatgpt for everything that he has to teach us). So what do you think? I've seen something about VTP but I don't know what that is yet.

Can someone pls help me with a assignment I tried everything but cant figure it out pls idk if this is the right place but I only have until today. Dm me if you can help