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7
votes
3answers
2k views

Should I let email bounce or send it to a blackhole?

I have a lot of unused (old, dead) accounts on my machine. Many of them receive literally thousands of emails a day, all spam. If the account was used by a person, I let the email bounce so that ...
1
vote
2answers
2k views

Black Hole DNS on Windows DNS Server

I am looking at configuring our Windows DNS Servers for some type of DNS based blackhole operation. Ideally, we would be able to use feeds from MalwareDomains.com or the like. I was curious how one ...
4
votes
3answers
722 views

A way for DNS record to say “this domain has no mail server”?

What is the appropriate way to set up a DNS record that says "this domain has no mail server"? I assume I need a special MX record to do this, otherwise it will be assumed that the A record is the ...
1
vote
1answer
532 views

Why might POSTing cause a blackhole?

I'm developing an app using CakePHP and have encountered a strange problem: When I POST data to a particular method I get a 0 byte response and a simple 404 error in the access log. ...
0
votes
1answer
794 views

How to setup :fail: default email address in cPanel?

How to setup a :fail: default email address in cPanel?
4
votes
2answers
660 views

Blackhole route private intranet traffic

I have a private network with a handful of Linux routers all route sharing via OSPF. How do I blackhole private network ranges that I don't have routes for? In other words, I want to be sure I NEVER ...
1
vote
1answer
64 views

Webserver Responses Hanging

From some networks requesting certain images on our webserver is very flakey. I've looked at tcpdumps on both sides and the server sends back part of the file and the client ACKs the TCP packet but ...
1
vote
2answers
745 views

Apache VirtualHost Blockhole (Eats All Requests on All Ports on an IP)

I’m exhausted. I just spent the last two hours chasing a goose that I have been after on-and-off for the past year. Here is the goal, put as succinctly as possible. Step 1: HOSTS File: 127.0.0.5 ...
3
votes
4answers
1k views

Providing DNS redirection to honeypot server for known bad domains

Currently running BIND on RHEL 5.4 and am looking for a more efficient manner of providing DNS redirection to a honeypot server for a large (30,000+) list of forbidden domains. Our current solution ...
0
votes
4answers
301 views

Does it matter if your web server's IP is RBL'ed?

We have a web server (on Slicehost) with an IP address that has been blacklisted in at least one DNSRBL (FIVETEN). The host is not currently a source of mail, in fact all mail for the domain goes ...
1
vote
1answer
702 views

net.inet.tcp.blackhole option on Fedora

This link: http://www.freebsdblog.org/51/reduce-server-visibility/ suggests a configuration option for FreeBSD that tells the system to drop all packages arriving from the network to a closed port ...
0
votes
3answers
1k views

Is there any difference between prisoner.iana.org, blackhole-1.iana.org, and blackhole-2.iana.org?

Probably not the most useful question, but I'm curious: I understand (in theory) that if a reverse lookup for a private IP makes it makes it past your own DNS servers you should get back ...