Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [overflow]

8 questions
2
votes
1 answer

Need Tips for Expanding My Organisation's Guest Network

I work for a Conference Center and we are rebuilding the network for our guests to use. I am functionally a high school intern with relatively little networking experience but I have so far put in a new router to replace our old one and put new AP's…
Justin Sybrandt
  • 21
  • 2
2
votes
2 answers

"Relay access denied" overflowing postfix mail.log

My mail.log is overflowing with random spammers attempting to send spam through my server. Is this typical or have I misconfigured something? Is there a way to ban an IP after several attempts of relaying or is there a way not to log these…
styts
  • 245
  • 1
  • 2
  • 6
1
vote
1 answer

Kernel: dst cache overflow

I'm under continuous floods at time that are generally of lower magnitudes. I've observed my system often to become totally unresponsive on its network while I observed this in the logs, kernel: [455951.513204] __ratelimit: 1771 callbacks…
John Elvy Adam
  • 23
  • 2
  • 7
1
vote
2 answers

How can I boot Linux with too many logical volumes?

I've created 45 logical volumes (and one extended) with fdisk on a non-boot HDD. Now the system refuses to boot, as well as any Linux live CD, that I've tried. Computer always turns off just after starting loading kernel (when loader output is…
ayvango
  • 131
  • 1
  • 2
1
vote
1 answer

Failed PCI Compliance - Port: 21 Protocol: tcp | Summary : attempts some buffer overflows

We have had PCI compliance for about 4 months straight then all of a sudden this comes up: Fail Serious Port: 21 Protocol: tcp Summary : attempts some buffer overflows CVSS Base Score : 10.0 (CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C) CVSS Temporal Score :…
Darren
  • 997
  • 2
  • 8
  • 15
0
votes
3 answers

Does apache/PHP has overflow problem if the developer doesn't tweak it at all?

Is apache/PHP self secured so that developers don't need to care about it?
apache
  • 3,227
  • 7
  • 27
  • 25
0
votes
2 answers

TCP sequence counter overflow

I have got the following question from a course: "Assume a TCP connection over the internet with a useable bandwith of 300Mbps. Assume that some packets are transported with a very high delay. At which delay time serious problems may occure? Is this…
Martin
  • 1,213
  • 1
  • 11
  • 10
-1
votes
2 answers

how to prevent non-admin user to gain admin access using overflow

There are all sort of coding best practices to prevent stack overflow attack but that is not what this question is about. What I want to know is how to prevent a legit non-admin user running a piece of code that will deliberately cause stack/heap…
strongline
  • 620
  • 3
  • 10