The spoofing tag has no wiki summary.
0
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1answer
30 views
Counter MAC Spoofing with Cisco
I was wondering if someone could help me with the needed cisco commands to configure a switch to only allow certain mac addresses on certain ports. So that one mac adres can only connect to the ...
0
votes
1answer
58 views
Tracking anonymous e-mail threat
A user spoofed/sent an email from http://emkei.cz/ with a very serious threat. Is it possible to trace this back or are we SOL?
There wasn't much in the email headers other than that it came from ...
0
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1answer
141 views
Can a machine(physical or virtual) accept and process UDP packets with a different IP address coming from a known device?
Before everything, thanks for reading the next question.
I have script,(ipUDPspoof.rb), which is a client/server script in Ruby (you choose the parameter 1 to be server and 0 to be client, at ...
0
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2answers
103 views
SSH:using single public key on multiple remote machines and spoofing-by-known-server
Lyrics
Usually, people say, that using single public key on several servers is just as secure as using unique public keys on each of them. (If we're not talking about possibility of private key being ...
0
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1answer
253 views
oidentd properly configured yet not properly working on CentOS 6
I've been experiencing this problem with oidentd for a couple of days and I can't seem to be able to find a solution to this yet.
oidentd seems to give me headaches every time I want to get it work on ...
0
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0answers
34 views
Whitelist Spoff “reply-to” email Exhcange 2010
We have a 3rd party which is now sending out emails to user@domain.com with the reply address set as otheruser@domain.com (instead of their own email server) and they are showing up in the inbox of ...
1
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1answer
108 views
Finding spoofed IP address on network
I have a few IP spoof dropped messages coming out of my Sonicwall firewall, we'll call them Source A and Source B. Both of these sources have the same mac address indicating they're coming from the ...
0
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3answers
283 views
Exchange and SPF Records
I've created an SPF record on 123-Reg, which is working great. But my question is how Exchange servers know that an SPF record exists when they receive mail from a domain. How does Exchange know it ...
1
vote
1answer
318 views
Prevent mail server (sendmail) used to backscatter
Hi I recently got an email from Amazon, saying that my EC2 instance is sending spam. So what they say is my mail server is receiving email for a non-existing user and therefore bounces the email back ...
3
votes
1answer
195 views
How did this email bypass my SPF settings?
I received a phishing email this morning that appeared to come from one of my addresses to itself.
Looking at the headers, I found something interesting.
DomainKey-Status: no signature
...
3
votes
3answers
186 views
How to Limit the Damage of Domain Spoofing
My e-mail account, for my privately run business which I'll call "VeryCoolCompany", is starting to receive bounce-backs for users who don't exist, like these:
alan12ab1@verycoolcompany.com
...
6
votes
5answers
364 views
Any way I can correct DNS spoofing against our domain
This morning I found out that our domain and subdomains have been poisoned on the 4.2.2 and 4.2.2.1 DNS servers along with others I think, though I have not confirmed others yet. Using OpenDNS ...
1
vote
2answers
650 views
ISP login, MAC spoofing, WiFi and multiple devices
I have a Tikona Digital Broadband (WiMax based) Internet Connection which allows limited number of devices to be connected at a time and also requires that the users login with username and password ...
3
votes
6answers
915 views
How reliable are IP address-based firewall restrictions?
On some of my production systems that need to be accessible outside of the LAN I will sometimes add a firewall restriction at the edge to only permit traffic on, say, RDP from a specific origin IP ...
0
votes
2answers
927 views
Different Mac address to virtual interface and primary interface
I am developing a system, where I need virtual interface to have different mac address for my primary and virtual interface
lets say my mac for eth0 is 00:11:00:11:00:11
and my virtual interface is ...
1
vote
1answer
558 views
When a client sends a RST packet, will the server close the connection ?
What I'm trying to do is block RST attacks with IPTables.
When I do a search for it, I'm seeing rules where packets with the RST flag set is being rate limited.
I'm questioning it a little bit. I ...
11
votes
4answers
5k views
Can the IP address for an HTTP request be spoofed?
On a website I am building, I plan to log the IP addresses of submissions, just in case it's necessary. I don't mind proxies, but outright spoofing your IP address would defeat the purpose.
To ...
1
vote
1answer
234 views
DDoS false IP attack [duplicate]
Possible Duplicate:
DDoS attack, how to stop?
I'm getting 10MB attacks, IP spoofing, which is used fake IPs, causing high CPU usage of the machine, and falls all. What should I do to ...
0
votes
1answer
143 views
iptables: is it possible to spoof NEW packets and make them look like ESTABLISHED packets?
See title for the question.
This question relates to a previous question wherein I asked the difference between NEW,ESTABLISHED and RELATED , see it here iptables: difference between NEW, ESTABLISHED ...
-2
votes
1answer
277 views
Can an attacker exploit the vulnerability of the firewall to access the www server?
What happens if an attacker has found a technique for sending packets through the firewall to the DMZ without the packets being checked?
Suppose the attacker doesn't know the internal addresses of ...
6
votes
1answer
1k views
How to prevent IP spoofing using MAC and ebtables?
I am trying to create IP-MAC pairing rules in ebtables. There are few tutorials and related questions [1] available but I have kind of specific setting.
ENVIRONMENT:
I have many physical hosts. Each ...
0
votes
1answer
131 views
Cisco 871 IOS BVI: Distinguishing incoming and outgoing
I understand that a BVI is very much equivalent to a network switch. But it includes the benefit of being able to have an access control list.
I am doing this, but I would like to more effectively ...
0
votes
1answer
130 views
Blocking External Mail Sent w/ Spoofed Email Address
We recently got an email from an outside server that had a spoofed "From:" header that was the email address of one of our users. Is there a way to have sendmail reject emails coming in from an ...
-5
votes
4answers
79 views
Hiding Gaming Software's Main Server [closed]
I run a gaming website. Players download the client software, install it and run it on their desktops. The software isn't hosted on the main server but I have been told that once the software is ...
0
votes
2answers
192 views
Hyper-V MAC Spoofing security hole
I have a windows 2008 R2 SP1 standard dedicated server and i installed Hyper-V role on it.
I'm serving Hyper-V VPSs on this server and i can't trust virtual nodes. now the broblem is each node can ...
0
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1answer
247 views
Banner Grabbing Spoofing
I run a windows server 2008 standard R2. Is there a way to spoof the server banner ?
So instead of Microsoft-IIS/7.5 it could be anything.
1
vote
1answer
543 views
Linux-KVM / iptables: prevent guest spoofing by matching ip+mac address on bridge?
I have my KVM guests on a standard br0 bridge setup:
auto br0
iface br0 inet static
address 192.168.1.117
netmask 255.255.255.0
network 192.168.1.1
broadcast 192.168.1.225
gateway ...
0
votes
2answers
263 views
My exchange 2003 mail server is blocked by RBL lists. Someone is sending spam from inform@mydomain.com
All outgoing email to external recipients from my Exchange 2003 server is getting blocked by RBL lists.
I'm new to administrating Exchange and i checked the Message Tracking Center under System ...
0
votes
1answer
468 views
What's the best way to block IP spoofing on a layer 3 switch?
We're hosting Dedicated Servers and are currently using old 3com switches with IP-based ACLs. So each port has an ACL that allows all IP addresses assigned to this customer, and blocks everything ...
1
vote
1answer
648 views
Using arpwatch to backtrack proxy access ip to eap-tls certificate
In my network I am using eap-tls authentication (machine certificates) for clients. Those clients are using a squid proxy to access the internet. The proxy is logging the request to the access.log. ...
1
vote
2answers
147 views
MAC spoofing - keeping the connection alive
Is it possible to keep a connection alive, while spoofing/changing the MAC address of your own network adapter (especially wlan adapter), without needing to re-authenticate against 802.1X ...
2
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3answers
1k views
Stop spoof emails in Google Apps
Desperately need some help here. I've been using Google Apps for my domain (2qubed.co.uk) for over 2 years now with no problems at all until recently.
For the past few months I have been getting lots ...
5
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3answers
3k views
How to prevent ip spoofing within iptables?
My Apache web-server on Linux is being flooded by massive requests for a non-existent file. The immediate impact is the rapid growth of the access & error log. I already took care of this by not ...
0
votes
3answers
92 views
How to scan for which ports would be open to another location
I'm just assessing the security of my home server in preparation for opening it up to the internet. I've used nmap from a machine on my local network but I have firewall rules allowing access from the ...
0
votes
1answer
322 views
How to avoid sendmail relay domains spoofing
I have a bunch of domains as relay domains at my sendmail config, i noticed that some dirty botnet is using dns spoof to be able to send emails using those relay domains.
How it works:
a domain ...
5
votes
4answers
486 views
MAC address spoofing - why doesn't this work?
So I'm in a new job, and they're pretty draconian about their network, hardware, and OS security. :-( I'm a web developer, but am forced to use IE7 for development simply because they don't want ...
1
vote
1answer
141 views
Preventing Email Spoofing
I use Google Apps with my domain.
Recently, we have begun to receive spam that gets past Google's spam filters. They are from our own email addresses.
I am wondering how to prevent this kind of ...
0
votes
1answer
2k views
ISA Server dropping packets as it believes they are spoofed
We have ISA Server 2004 running on Windows Server 2003 SP2.
It has 2 NICs - one internal called LAN on 192.168.16.2, with a subnet of 255.255.255.0, and one external called WAN on 93.x.x.2. The ...
0
votes
4answers
367 views
I need to somehow change my ip address
i`m in a lan using iptables/masquerade.
what i want to do, is to login in a web application.i write my user and passwd and click login and everything is fine, but if i try to modify something in that ...
0
votes
1answer
731 views
Redirecting requests from domain to local server
I'm developing a web application for a pre-production hardware device which has the domain from which it loads the app hard-coded. Is there a (simple) way for me to reroute these requests to a local ...
1
vote
3answers
872 views
How to avoid DNS spoofing for DNS lookup
I am trying to find a way to obtain the real ip addresse(s) for a domain name. I'm working on a router doing traffic shaping with the use of iptables and tc. I then need to setup iptables rules for ...
44
votes
15answers
6k views
Are IP addresses “trivial to forge”?
I was reading through some of the notes on Google's new public DNS service:
Performance Benefits
Security Benefits
I noticed under the security section this paragraph:
Until a standard ...
2
votes
2answers
226 views
Can IP spoofed traffic get above the transport layer?
I'd like to know whether you could get packets with a spoofed IP address above the transport layer. My thoughts are:
TCP: No, as acknowledgements would never get to the original sender if their IP ...
2
votes
2answers
2k views
Reject obviously spoofed messages in Exchange 2007 SP2
I have an Exchange 2007 SP2 server which happily accepts SMTP messages whose sender is SomeRandomString@mydomain.com and the recipient is SomeRealUser@mydomain.com; this leads to all sort of spoofing ...
