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Special Forums IP Networking IPTables question
# 1  
Old 02-20-2011
IPTables question
Hope someone can help cus m really stuck.
Im pretty good at making basic IPTables rules to get what i need done, but this one has me beat.

I have only 1 Nic in my linux box , and its setup as a trunk to my switch.
I have 5 vlans setup on it:

eth0.1000
eth0.1001
eth0.1002
eth0.1003
eth0.1004

I can get it to route between the vlans without trouble using a simple
-A INPUT -i eth0.1000 -j ALLOW
-A INPUT -i eth0.1001 -j ALLOW
-A INPUT -i eth0.1002 -j ALLOW
......ect
With forward, input and output set to accept.

Now if I ssh to any machine on any Vlan it routes between them perfectly.

PROBLEM IS:

Reversing the accept to drop and lock down the routes to just allow SSH.
If tried things like -A FORWARD -i eth0.1000 -o eth0.1001 ect and I cant get it to allow ssh from and to my separate vlans.

Can anyone help, all i want is a basic iptables to allow ssh from any machine on any vlan to any machine on any vlan, but block everything else.

Thanks for ANY advice.

Steve
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LEARN ABOUT CENTOS

column

COLUMN(1)							   User Commands							 COLUMN(1)

NAME

       column - columnate lists

SYNOPSIS

       column [options] file...

DESCRIPTION

       The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file or, by default, from
       standard input.	Empty lines are ignored.

OPTIONS

       -c, --columns width
	      Output is formatted to a width specified as number of characters.

       -t, --table
	      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default,  or  with
	      the characters supplied using the separator. Table output is useful for pretty-printing.

       -s, --separator separators
	      Specify possible table delimiters (default is whitespace).

       -o, --output-separator separators
	      Specify table output delimiter (default is two whitespaces).

       -x, --fillrows
	      Fill columns before filling rows.

       -h, --help
	      Print help and exit.

ENVIRONMENT

       The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

       sed 's/#.*//' /etc/fstab | column -t

BUGS

       The util-linux version 2.23 changed -s option to be non-greedy, for example:

       $ printf "a:b:c
1::3
" | column  -t -s ':'

       old output:
       a  b  c
       1  3

       new output (since util-linux 2.23)
       a  b  c
       1     3

SEE ALSO

       colrm(1), ls(1), paste(1), sort(1)

HISTORY

       The column command appeared in 4.3BSD-Reno.

AVAILABILITY

       The column command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   October 2010 							 COLUMN(1)