I open the browser and request a web page. The DNS query is sent to the DNS server of my company and replies my GNU/Linux machine with a DNS response. I have "insmod"ed a kernel module that picks up the DNS response and over rides the "Addr" field of the "Answers" Section of the DNS response packet with a different IP address. However, after overriding the "Addr" field, my machine sends a ICMP(Host unreachable, administratively probihited) msg to the DNS server.
Can some one throw light on what is happening.
I am using netfilter frame work in my module and tweaking the DNS response in the NF_INET_PRE_ROUTING hook.
I m attaching the wireshark pcap.
192.168.180.29 - IP of my machine.
192.168.164.12 - DNS server IP.
My company has a private network, including a Apache web server (Linux) and some WinXP machines. The web server had been configured to use mod_proxy to connect to window update site via another company proxy server. It works for few years.
Recently, some parties had setup a DNS server on the... (2 Replies)
Guys,
My awk is not very good and I'm kind of stuck.
I have a file like so:
1,a,a,ab1234,ab1234,e,f
2,a,b,cd1234,ef5678,e,f
3,a,a,cd3456,gh5678,g,h
4,a,b,ef5678,ef1234,g,h
5,a,a,cd7890,ab5678,e,f
6.a,b,cd7890,jk1234,il
I don't care about any other columns other than col4 and col5.
... (6 Replies)
All,
I am pretty new to Unix and still in the learning curve :) I have a simple requirement for which I did not get an answer yet (Atleast I do not know how to keyword the search for my requirement!!!).
I have an executable script my.script1 in a folder /data/misc/scripts/dev, which when... (5 Replies)
How can i tweak sendmail configuration files so that the "Received:" field is removed from email header information?
Or else can i change Received: (from enswitch@localhost) in email header to something likeReceived: (from xyz@localhost)?
---------- Post updated at 09:57 PM ---------- Previous... (2 Replies)
Hi
We run a script that queries a database via the internet and we need the fast possible connections to the database server.
I have centos server which sends the requests to the database across the internet . it sends upto 800 queries per milliseconds however this using the default... (4 Replies)
I am trying to setup a CentOS 6.2 server that will be doing 3 things DHCP, DNS & Samba for a very small office (2 users). The idea being this will replace a very old Win2k server. The users are all windows based clients so only the server will be Linux based.
I've installed CentOS 6.2 with... (4 Replies)
hello everyone,
I am trying to compare two files and have the result in a new files. When I used diff I am getting the header, '<' and '>' in my result which I don't want to have it in my output file. :wall:
opt/sam/input: diff file1.txt file2.txt
1,20d0
< 16,ZA,
< ZJ,08,
< Z7,03,
Any... (1 Reply)
Hello!
I'm trying to tweak my regular expression to take care of this tedious little "blank space" problem. I don't know what's causing the " : 2 times, lines 1, 5," to be printed.
Here is what the input looks like:
http://i48.tinypic.com/34g0tv8.png
Here's what the output is... (6 Replies)
Hi,
I have a Windows based Domain (abc.com)servers like:
172.30.1.246
172.30.1.247
172.30.3.246
172.30.3.247
On all my Linux servers (/etc/resolv.conf) have a following DNS servers entries:
nameserver 172.30.3.246
nameserver 172.30.3.247
But when i ping my Domain (abc.com), it... (5 Replies)
Discussion started by: refra
5 Replies
LEARN ABOUT CENTOS
net::dns::mailbox
Net::DNS::Mailbox(3) User Contributed Perl Documentation Net::DNS::Mailbox(3)NAME
Net::DNS::Mailbox - DNS mailbox representation
SYNOPSIS
use Net::DNS::Mailbox;
$mailbox = new Net::DNS::Mailbox('user@example.com');
$address = $mailbox->address;
DESCRIPTION
The Net::DNS::Mailbox module implements a subclass of DNS domain name objects representing the DNS coded form of RFC822 mailbox address.
METHODS
new
$mailbox = new Net::DNS::Mailbox('John.Doe@example.com');
$mailbox = new Net::DNS::Mailbox('John Doe <j.doe@example.com>');
Creates a mailbox object which represents the DNS domain encoded form of the mail address specified by the character string argument.
The argument string consists of printable characters from the 7-bit ASCII repertoire.
address
$address = $mailbox->address;
Returns a character string containing the RFC822 mailbox address corresponding to the encoded domain name representation described in
RFC1035 section 8.
DOMAIN NAME COMPRESSION AND CANONICALISATION
The Net::DNS::Mailbox1035 and Net::DNS::Mailbox2535 subclass packages implement RFC1035 domain name compression and RFC2535
canonicalisation.
COPYRIGHT
Copyright (c)2009,2012 Dick Franks.
All rights reserved.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, Net::DNS, Net::DNS::DomainName, RFC822, RFC1035, RFC5322
perl v5.16.3 2012-12-28 Net::DNS::Mailbox(3)