Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
The results are in! See what nearly 90,000 developers picked as their most loved, dreaded, and desired coding languages and more in the 2019 Developer Survey.

Questions tagged [dhcp]

The tag has no usage guidance.

0
votes
0answers
25 views

How can Ettercap act as a client instead of a gateway?

I am trying to execute an attack that requires a full-duplex MiTM position. This is the reason why I choose to use Ettercap. I have picked DHCP spoofing as the attack of choice. The problem that I ...
0
votes
1answer
79 views

Do ISP’s in America keep IP assignment logs forever? [closed]

I read that the majority of ISP’s keep theirs for at least 180 days. However, does anyone know how long charter spectrum keeps theirs? Do ISP’s retain their logs forever even if they are using a DHCP ...
0
votes
1answer
100 views

dhclient cloud-init /var/tmp process

There's a process that's running that I'm trying to investigate why its running and what its doing. The server is a Linux Ubuntu server running on AWS. Running 16.04. The process in question is: ...
0
votes
1answer
124 views

How DHCP client can determine that 802.1x Port based authentication has been completed and its time to trigger DHCP discover

I have a Supplicant running on 1 Linux box attached with a Free radius server on other linux box with cisco catalyst switch (with 802.1x Port based access) in between. Now I have been able to ...
0
votes
1answer
70 views

Would it be possible for a malicious user to change the LAN IP address of an uncompromised device?

I have a local network and an IPCam (with its own storage) in it. Due to some practical limitations, I cannot use technologies such as AP isolation or VLAN to isolate low-integrity and high-integrity ...
3
votes
2answers
1k views

Why is DHCP considered insecure?

Most places I've worked at consider DHCP to be a bad idea for management networks, or "secured" networks. I'm curious as to why that is. Consider this scenario... There is an ISCSI storage network,...
-5
votes
1answer
241 views

IP address obfuscation [closed]

IP address obfuscation is a well known approach (for example, MLA Kewley, Dorene, et al. "Dynamic approaches to thwart adversary intelligence gathering.") The approach suggested, is mainly used in ...
-5
votes
1answer
419 views

How does resolv.conf work? [closed]

Can someone try explaining (in simple terms) how Wi-Fi routers push nameservers and routes to my resolv.conf? I've noticed it gets changed automatically as I move between different Wi-Fi networks. I ...
0
votes
1answer
2k views

Can't connect to fake AP with airbase-ng

I use kali-rolling on a virutal machine and I try to set up a fake access point using airbase-ng, but my devices won't connect to it whatsoever. My steps are: I put my wirless adapter in monitor mode ...
3
votes
3answers
1k views

Is SSL/TLS pointless for IRC?

Assuming a network which has absolutely no support for SSL/TLS, as rationalised by this blog post, is it possible guarantee the security of privileged operator connections? There are already ...
3
votes
2answers
2k views

What is the role of ARP poisoning when doing a DHCP spoofing attack

My Current Background on the topic DHCP Spoofing is done by a rogue DHCP server on the network which replies to DHCP requests from hosts(Attacker can run a DHCP starvation attack on the legitimate ...
2
votes
1answer
712 views

DHCP Starvation attack

The client and the DHCP server exchange four messages (Discover, Offer, Request and Acknowledge) before reaching agreement on leasing a certain IP address for a certain time. On the other hand, the ...
4
votes
1answer
459 views

DHCP Starvation Attack doesn't work in my virtual lab

I've installed DHCP server in VirtualBox host-only network type. Other clients in VirtualBox can get their IP addresses successfully from my DHCP server. I've decided to attack this DHCP server and ...
1
vote
0answers
1k views

Creating a rogue AP with Kali Linux

so i have for the last 2 days going through this task of setting up a Rogue AP on my Kali linux running in my VM.... i am using the 64bit version and the wifi adapter is TP link TL WN722N, so my ...
0
votes
1answer
46 views

Setting Up My first network Labs? [closed]

so i'm a complete newbie to this field, but i'm using this book - 'Metasploit The peentration Tester's Guide' - by David Kennedy, etc. I'm attempting to set up the virtual labs needed in order to ...
3
votes
2answers
297 views

Is DHCP spoofing ever possible on VMware?

So I've just watched this Defcon video:https://www.youtube.com/watch?v=RaA5dEIqzzQ&t=1583s. Apparently they were able to set up a rouge DHCP server and get a 50/50 chance of sending the victim the ...
4
votes
3answers
271 views

How should I respond to an unrecognized client in my DHCP logs?

I've found a strange hostname in my dhcpd.leases file and I'm wondering what steps I should take in response. I have a simple home network: my modem is plugged into a router running OpenBSD 6.0, and ...
2
votes
1answer
131 views

Can someone be connected to a router but not be in the DHCP table of a router [closed]

First I would like to say that I didn't know how to format the proper title but below is the issue. I have a router that connects to the ISP but in this router there X people connected, i know all ...
4
votes
1answer
294 views

Cant access most websites using a fake AP created by aircrack-ng suite

The question , Setting up a fake AP - problem with iptables and DNS server , I posted before was answered and fixed, to not confuse people looking for the same problem in the future I wanted to post a ...
4
votes
0answers
380 views

SIEM: Monitoring End Users and DHCP IP assigning issue

I want to monitor my end users activity for which I have selected Alien Vault as my SIEM solution. Now, when I see logs coming in and I see malicious activity at a certain IP (e.g 10.10.10.4) with ...
0
votes
2answers
696 views

RaspberryPi3 wont show fake AP created by Airbase-ng

Im using Aircrack-ng suite to apply an evil-twin attack with my RaspberryPi3 operated by Kali-linux on another RspberryPi3 with Raspbian Jessie. The steps are as followed: 1.configuring the apache2 ...
6
votes
1answer
187 views

What is the simplest way to prevent adding a new default route via dhcp?

I have a corporate network to which remote access is provided via openvpn. Customers include a variety of devices (laptops, smartphones). These devices running software that accesses corporate ...
0
votes
1answer
228 views

DHCPig not making the hosts discard IP configuration

In DHCPig I have the option to send RELEASE packets to all hosts in the network. This should result in the hosts discarding their configuration. This is the command I ran: pig.py -r eth0 I did run ...
1
vote
1answer
113 views

Nemesis packets not detected in wireshark/tcpdump

I have been using nemesis for forging fake DHCP request packets on my Ubuntu machine. I get a "packet injected" message each time I inject it. However I was not able to analyze it on wireshark as my ...
1
vote
3answers
957 views

Is HTTPS over wifi still safe if a hacker can set up a rogue DHCP server?

I always heard that entering passwords or any sensitive information while using a public wifi spot is safe only when visiting an HTTPS website, ensuring that the URI and certificate are valid. Many ...
4
votes
1answer
362 views

What are the security risks of using public address schemes for the DHCP of your VPN'd Users?

At the company I work for we recently purchased a network scanning tool to help with asset inventory and overall PC network management. My supervisor, while looking at the different IP address ranges ...
0
votes
1answer
3k views

Android devices are unable to connect to Rogue Acces point created using Airbase-ng

I have created a rogue access point using airbase-ng, but I can't connect to it using my android phones (note II, S4), when I tap on the access point all I get is: Obtaining IP address...', than ...
1
vote
1answer
141 views

Secure DHCP, DNS, Active Directory Server

Are there any common vulnerabilities when creating a DHCP,DNS, and Active Directory server that should be addressed immediately? The operating System is Windows Server 2012 R2 64-bit.
1
vote
1answer
415 views

Yersinia raw packet

I'm using Yersinia to pentest my network. There are two options send raw packet and creating DHCP rogue server I don't understand fully. Can someone explain the meaning of these options?
1
vote
1answer
446 views

DHCP Exhaustiation / Rogue DHCP interrupted by real DHCP NACK

I was trying to run a Rogue DHCP Server which should cause a MITM attack. I did the following Exhaust the real DHCP Server using DHCPig (worked) Run a Rogue DHCP Server using the auxiliary/server/...
2
votes
0answers
414 views

ArpON not working

i'm trying to setup ArpON on my laptop running Ubuntu 14.04. I have a DHCP network so in the configuration i uncommented the DARPI line, then set RUN to yes. Then i started the daemon with sudo ...
3
votes
1answer
442 views

How can I launch DHCP starvation attack in WLAN?

In WLAN, due to MAC association on Access Point (AP), I can't send the DHCPDISCOVER messages using random MAC addresses. But if I keep my original MAC address as the source ethernet MAC a and random ...
2
votes
3answers
1k views

How can I set up DHCP so that domain devices get a certain block of IP addresses and other non-domain devices get a separate block?

Is there a way for me to set up DHCP so that only domain devices get an IP Address from a certain subnet, say 192.168.12.x, and other non-domain devices would be assigned to a different subnet? Edit: ...
3
votes
1answer
711 views

Is it possible to intercept traffic by using a WAN facing DHCP server on an ISPs cable network?

I am running pfSense on an edge firewall conncted to a cable line. I can see many DHCP requests hitting my firewall. I guess this requests are getting send by cable modems currently booting up and ...
1
vote
2answers
1k views

How does DHCP starvation work? How to prevent it?

Is it the same as DHCP exhaustion? Can LANs be vulnerable to such attacks or it's against WiFi only?
1
vote
1answer
3k views

shellshock dhcp exploitation

An attacker can exploit the bash bug in the DHCP protocol. On searching , how this can be performed , I found "http://www.sectechno.com/2014/09/28/shellshock-dhcp-server-exploitation/" , but could ...
9
votes
2answers
3k views

Is connecting to an open WiFi router with DHCP in Linux susceptible to Shellshock?

Source: http://lcamtuf.blogspot.com/2014/09/quick-notes-about-bash-bug-its-impact.html For the same reason, userland DHCP clients that invoke configuration scripts and use variables to pass down ...
0
votes
2answers
434 views

PXE TFTP Vulnerabilities

I am planning to implement diskless clients for booting Windows 7 clients. I am trying to determine whether to use PXE with TFTP or iPXE with HTTPS or iSCSI. Are there any vulnerabilities with using ...
8
votes
4answers
8k views

What are the biggest security concerns on PXE?

What are the top security concerns when setting up a PXE (Preboot Execution Environment) booting environment, ordered by severity of a possible exploitation? Things that I thought of are (in no ...
3
votes
1answer
9k views

How to prevent DHCP Starvation attack?

All this while, I assumed that switchport security is enough to prevent DHCP dos attack. If I set it maximum 1, there can be no more mac addresses packets. But, a friend told me that using the tool, ...
14
votes
4answers
46k views

Detecting(and locating) rogue DHCP server on a local area network

How would we detect and locate a rogue DHCP server on our local area network?
-3
votes
2answers
998 views

How do cellphones discover wireless APs? [closed]

I'm trying to find some information on how cellphones discover which wireless networks are in range? Is it via ARP or DHCP discover? Also how often does a cellphone do this polling? I can't find any ...
1
vote
2answers
2k views

bootp enabled by default on dhcp reduce security?

by default in Microsoft DHCP server configuration Bootp is enabled and choose both(accept DHCP request and Bootp ) i know that how this work and know about how configure two DHCP Server by Bootp ...
14
votes
3answers
3k views

Is a predictable MAC address a risk?

If you knew from the public internet that a certain IP address belonged to a machine with a certain MAC address, can you see any security exposure associated with that? I know that some software will ...
3
votes
5answers
12k views

Stopping users from spoofing an IP

I have a MikroTik router (that has firewall and scripting capabilities) that is acting as a DHCP server for the 192.168.1.0/24 subnet. Is there any way I can stop it from passing traffic from a user ...
7
votes
4answers
26k views

What are the laws regarding ISP recording IP addresses? How would they know who had which?

Since most internet users have ISPs using dynamic IP addresses (e.g. someone gets a new external IP address every few days) are there any laws requiring the ISPs to keep logs associating an IP address ...
-1
votes
1answer
289 views

Impact of attack occured in Radius, DHCP and HTTP servers on VOIP?

Assume we can crash the RADIUS server in a VOIP system. What would be the impact on the confidentiality, integrity, and availability of VOIP service. What would be the impact if the same question if ...
2
votes
1answer
818 views

Large lan party : How to identify the users on the network?

I would like to know what are the good way to identify users on a large lan party when you manage network ? I had the idea to make the users register them self at a desk, they give us Firstname, ...
3
votes
1answer
607 views

captive portal wikipedia article

Something on the wikipedia page regarding captive portals have confused me: http://en.wikipedia.org/wiki/Captive_portal When a client requests a website, DNS is queried by the browser. The ...
10
votes
7answers
3k views

How can I restrict access to network data by an unauthorized computer that connects via Ethernet?

I assume I can configure most routers to only assign IP addresses to specific MAC addresses, as is possible with wireless routers. However what if a computer is connected via Ethernet and does not ...