12-19-2001
Solved it, now to refine....
I've located the source of the problem: IPCHAINS.
When I stop my firewalling on the Linux box local and remote DNS resolution are both fine.
My ipchains rules are as such (assuming that the IP address of my box is 123.123.123.123):
:input DENY
:forward DENY
:output ACCEPT
-A input -p icmp -j ACCEPT
# dns
-A input -d 123.123.123.123 53 -p udp -j ACCEPT
-A input -s 123.123.123.123 53 -p udp -j ACCEPT
-A input -d 123.123.123.123 53 -p tcp -j ACCEPT
-A input -s 123.123.123.123 53 -p tcp -j ACCEPT
# ssh
-A input -d 123.123.123.123 22 -p udp -j ACCEPT
-A input -s 123.123.123.123 22 -p udp -j ACCEPT
-A input -d 123.123.123.123 22 -p tcp -j ACCEPT
-A input -s 123.123.123.123 22 -p tcp -j ACCEPT
which in my mind would allow all ssh trafic (which it does) and all DNS traffic, regardless of whether it travelled over udp (usual) or tcp (rarely). The connection should also be allowed both ways, surely.
Can anyone spot any obvious mistakes? Thanks again.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
what is dig? Is it just a advanced type of nslookup?
how to use it?
//nicke:confused: (1 Reply)
Discussion started by: nicke30
1 Replies
2. Shell Programming and Scripting
First I would like to thank you for your time in running a great Forum!
Background - Windows/ASP/VB COM/SQL Server programmer/Webmaster.
Desire - To build similar skillset on UNIX. I am looking at learning Perl or Python (maybe Jython due to connection to Java). I have a brief background... (3 Replies)
Discussion started by: nimrod
3 Replies
3. UNIX for Dummies Questions & Answers
When I use the linux dig command such as #dig yahoo.com it resolves
but when I use the same command as root it gives me error "Segmentation Fault"
Please advise I am completly baffled. (1 Reply)
Discussion started by: Tirmazi
1 Replies
4. Solaris
Hi all,
Apologies if this is the wrong forum for this question, if it is, could some one point me to the right one please.
I am trying to compile bind-9.5.1b1 on Solaris 10
Get the error when try to configure:
checking for OpenSSL library... using OpenSSL from /usr/local/lib and... (5 Replies)
Discussion started by: callmebob
5 Replies
5. UNIX for Dummies Questions & Answers
all,
i am newbie to dns bind . Any help is very appreciated.
I am using dig command to view the records in the config. I am expecting the following comamnds to display all the A (Address records) in the zone data file.
my zone data file looks like this
-------------------
$ORIGIN .
$TTL... (2 Replies)
Discussion started by: sujathab
2 Replies
6. UNIX for Dummies Questions & Answers
Hi Guys,
I just need a confirmation if what think i know is right .
dig yahoo.com
; <<>> DiG 9.7.0-P1 <<>> yahoo.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27410
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
... (1 Reply)
Discussion started by: mtomar
1 Replies
7. IP Networking
Can I use two different DNS servers in the one command in the form of primary and secondary.
Take this for example:
dig @<primaryAddress> @<secondaryAddress> MX domain.tld
So if primary address is down, it will use the secondary address as a backup. It seems to work when testing, but thought... (1 Reply)
Discussion started by: neil_is_ere
1 Replies
8. UNIX for Advanced & Expert Users
Hi,
I have these entries in the /etc/esolv.conf:
------------
domain xxxxxx
search yyyyyy
nameserver 127.0.0.1
nameserver aaaaaaaaaaaaaaaa
nameserver bbbbbbbbbbbbbbbb
-------------
When I use 'dig' or 'nslookup' command, like 'dig yahoo.com' it uses the localhost as the server.
I... (2 Replies)
Discussion started by: chaandana
2 Replies
9. Shell Programming and Scripting
Hi,
I am testing some code to match a grep to see if one of the dns server exists but it does not seem to match:
ERROR:
=======
CRITICAL: google.com DNS : ns3.google.com NOT found
CODE:
=====
if ; then
echo "OK: google.com DNS : ns3.google.com exists"
else
echo... (5 Replies)
Discussion started by: dmccabe
5 Replies
10. Shell Programming and Scripting
Experts - I was hoping someone could help me out with the logic on this perl script.
I'm trying to run some dig commands and parse in such a way as to group them together.
Here's what I have so far.
#!/usr/bin/perl
system(clear);
my @host = qw/yahoo.com
google.com
/;
foreach... (2 Replies)
Discussion started by: timj123
2 Replies
LEARN ABOUT ULTRIX
resolv.conf
resolv.conf(5) File Formats Manual resolv.conf(5)
Name
resolv.conf - resolver configuration file
Description
The resolver configuration file, contains information that the resolver routines read the first time they are invoked by a process. The
resolver file contains ASCII text and lists the name-value pairs that provide various types of resolver information.
The file is required if your system is running BIND. This file must contain the BIND domain name for the local area network. If your sys-
tem is a BIND client, this file must also contain nameserver entries.
There are two entry formats for the file:
domain binddomain
This line specifies the default domain to append to local host names. If no domain entries are present, the domain returned by
after the first dot (.) is used. If the host name does not contain a domain, the root domain is assumed.
nameserver address
In this entry, the address is the IP address, in dot notation, of the BIND server that should be queried to resolve host name and
address information. You should have at least one name server listed. Two or more name servers reduces the possibility of inter-
rupted BIND service in the event that one of the servers is down. You can list up to (10) name servers. If more than one server is
listed, the resolver library queries you to try them in the order listed. If no name server entries are present, the default is to
use the name server on the local machine.
The algorithm used is to try a name server, and, if the query times out, to try the next, until out of name servers or the query is
resolved. The last step is to repeat trying all the name servers until a maximum number of retries has been made or the query has
been resolved.
The name value pair must appear on a single line, and the keyword or must start each line.
Examples
The following is an example of a file:
;
; Data file for a client
;
domain cities.us
nameserver 128.11.22.33
Lines beginning with a semicolon (;) are comment lines.
Files
See Also
gethostname(2), resolver(3), named(8)
Guide to the BIND Service
resolv.conf(5)