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Operating Systems
HP-UX
[HP-UX] Established ports although LAN is disconnected.
Post 302357533 by ejdv on Wednesday 30th of September 2009 05:28:05 AM
09-30-2009
Quote:
vbe;So I doubt it being an HP-UX core issue, I always understood "whoever (application) opens a connection is responsible for closing it"
It is always difficult to use the right technical terms and phrases, so my question may have come across a bit unclear.
First of all, I think it could be a general TCP/IP question, not really related to HP-UX.
It is just that it happens between 2 HP-UX boxes.
What I meant to say about it being a HP-UX core issue is that I expected the netstat information to come from the HP OS (for example the LAN adapter or so) and not from the applications that use ports/sockets.
Probably it is better to talk in TCP/IP terms, but one should know how
The assumption "whoever (application) opens a connection is responsible for closing it" makes sense, but in case of my issue, it forces me to take
into account that the netstat information is "unreliable".
Or better said: I have to keep in mind that this output is based on the information provided by the applications. A mind-shift.
In my case the LAN cable is pulled, so the first layer in the TCP/IP model, the link layer, is not present any more.
One box did the expected and released all related ports/sockets.
The other box is still pretending all is well.
As long as the application keeps the sockets in the established state, netstat will report them as established.
Which makes sense actually, while writing this, in principle the applications (application processes) are the best source for this, as they rely on this.
Anyway, bit by bit it is getting clearer, although I do not understand why the 2nd box is keeping the connections established.
I will read some TCP/IP information now, always useful
E.J.
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LEARN ABOUT DEBIAN
dnsspoof
DNSSPOOF(8) System Manager's Manual DNSSPOOF(8) NAME
dnsspoof - forge replies to DNS address / pointer queries SYNOPSIS
dnsspoof [-i interface] [-f hostsfile] [expression] DESCRIPTION
dnsspoof forges replies to arbitrary DNS address / pointer queries on the LAN. This is useful in bypassing hostname-based access controls, or in implementing a variety of man-in-the-middle attacks. OPTIONS
-i interface Specify the interface to use. -f hostsfile Specify the pathname of a file in hosts(5) format. Only one hostname allowed per line (no aliases), although hostnames may contain wildcards (such as *.doubleclick.net). expression Specify a tcpdump(8) filter expression to select traffic to sniff. If no hostsfile is specified, replies will be forged for all address queries on the LAN with an answer of the local machine's IP address. FILES
/usr/share/dsniff/dnsspoof.hosts Sample hosts file. SEE ALSO
dsniff(8), hosts(5) AUTHOR
Dug Song <dugsong@monkey.org> DNSSPOOF(8)