On Jan 28, 2008 8:45 AM, Tolun ARDAHANLI tolun.ardahanli@linux.org.tr wrote:
Hi guys;
OK let me explain like this...
We had a problem with our General network administration and our General network cant be managed so well(Cause of our IT manager is not so good about administration on our network). that is why i thing that our department's users must be separated from General LAN(Cause of our Generel LAN effected to our working performance). After that we separated our users to another subnet(192.168.1.xxx).
Right now all of my departments member joined to our server(Centos5.1) and all of them joins to internet over our server... We solved the problem together if you read all mails in this subject...
I thing Only problem is that "our members must not to reach server's internet side ip(192.168.10.13)" am i right for that?
192.168.10.13 and 192.168.1.100 refer the same centos server! Right ? Then this is the default behavior for a linux to answer requests on one interface, even if the request is for one address on another interface.
and other question is about "how can i stop the ssh service for the internet side ip(192.168.10.13)"?
2 possibilities
using iptables to reject/drop any packet coming from eth1 (or eth0)
iptables -t filter -A INPUT -p tcp -i eth1 --dport 22 -j DROP
Or force sshd to bind only to the internal address, this is ListenAddress in sshd config: man sshd_config for more
Regards.
I am not a network engineer... I am just a software engineer... I am trying to do our project on Linux systems... I cant focus so deeply on network administration... Only I can do your advise... not else... Cause I can't spent time for that(I want but I can't)..:(
I hope that I explained it well...;)...
thanks to all...
sincerely yours...
2008/1/25, Alain Spineux aspineux@gmail.com:
On Jan 25, 2008 9:37 AM, Tolun ARDAHANLI tolun.ardahanli@linux.org.tr
wrote:
Thank you for all really I solved the forward/ip sharing problem...
But I see there is other problem with that like this;
This is my network structure now; LAN(there are 3machines): start ip:192.168.1.10 end ip: 192.168.1.12 gateway address of users: 192.168.1.100 (my server's LAN side ip
address)
LAN side Server ip: 192.168.1.100
WAN(this ip comes from behind of swicth. the switch is behind of
firewall
and firewall is behind of router): WAN side Server ip: 192.168.10.13 gateway address of Server:192.168.10.1
And here is the problem i thing; The users from inside(LAN) can reach from server's WAN side ip(192.168.10.13) and they can ping it and they can take a services
which is
for LAN services(like ssh...etc).
I agree that pinging from LAN to gateway address(192.168.10.1). But I
cant
agree that pinging to server's WAN address(192.168.10.13). Do I thing
wrong
at this point? and last question is about how can I close/stop services
for
WAN side?
I dont understant! WHO is (OR CANNOT) pinging 192.168.10.13 or can (OR CANNOT) access the service ? LAN or WAN ?
thanks to all of you...
sincerely yours...
2008/1/24, Alain Spineux aspineux@gmail.com:
On Jan 24, 2008 5:42 AM, Alain Spineux aspineux@gmail.com wrote:
On Jan 23, 2008 9:43 AM, Tolun ARDAHANLI
wrote:
Hi again to everyone;
Guys your mails are very nice... i liked all of them...
let me give you about my system and my need(sorry for writing
these
late)...
I've got an IBM x3650 server which is open 7d/24h. It has got 2
ethernet
card. I would like to connect my LAN to WAN over this machine...
LAN(there are 3machines): start ip:192.168.10.10 end ip: 192.168.10.12 gateway address of users:192.168.10.13(my server's LAN side ip
address)
LAN side Server ip: 192.168.10.13
WAN(this ip comes from behind of swicth. the switch is behind of
firewall
and firewall is behind of router): WAN side Server ip: 10.10.1.223 gateway address of Server:10.10.1.111
this is my network chances...:( i cant change them cause our
company
has
strong rules for these addresses... I want to share my WAN side ip
address
to my LAN side...
How can I do that on my CENTos installed server?
thanks a lot to everybody...
The short way, supposing your wan is secure and your wan interface
is
eth1:
Disable any firewall rules on your centos,
service iptables stop chkconfig iptables off
try these commands, and if this is working put them in your
/etc/init.d/rc.local
# enable forwarding of packet between all interfaces echo 1 > /proc/sys/net/ipv4/ip_forward # config masquerading, any packet leaving eth1 will be masqueraded, taking eth1 address for source address. iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
Another interesting way, is to setup only routing on your centos, and add (ask your network manager) the route of your internal network (I guess 192.168.10.8/29 through 192.168.10.13 ) on your firewall and maybe a similar one on your router if the firewall is not doing NAT. Then your firewall administrator can control the access to any of your internal machines or make some of them reachable from outside if for example you want to have a web server or an email server (this is not a good idea, but you get the idea). All of this without chnaging anything more on your centos router.
To route packet only, without doing NAT (aka MASQUERADING or
HIDE-NAT)
just use echo 1 > /proc/sys/net/ipv4/ip_forward
Regards
Regards.
2008/1/22, Dennis McLeod <dmcleod@foranyauto.com >:
> I have an IPcop box setup at work. Using squidguard to keep
customers from
> surfing porn while they are in our waiting room. (On a
completely
separate
> DSL connection..) > > I have an Astaro Security Gateway setup at home (on a Dell p3
precision
> 220). Free home license, do FAR more than your typical broadband
router.
Not > a small learning curve, though. Wireless is through a D-link
DWL-7100(I
> think) access point in the attic. > I have a Linksys wrt54g (original version) with openWRT, but
it's
just
there > for backup..... > > Any of the above will accomplish your goal... > > > > > -----Original Message----- > From: centos-bounces@centos.org [mailto:
centos-bounces@centos.org]
On
Behalf > Of Alain Spineux > Sent: Tuesday, January 22, 2008 6:52 AM > To: CentOS mailing list > Subject: Re: [CentOS] How can i share my WAN ip to my LAN? > > On Jan 22, 2008 3:17 PM, William L. Maltby <
CentOS4Bill@triad.rr.com>
wrote: > > On Tue, 2008-01-22 at 14:49 +0100, Alain Spineux wrote: > > > On Jan 22, 2008 8:46 AM, Tolun ARDAHANLI < tolun.ardahanli@linux.org.tr> > wrote: > > > > Hi everybody... > > > > > > > > How can I share my WAN ip to my LAN? How can I do that I
really
> > > > dont know...:( I am using linux long time ago but this
kind I
> > > > would like to do newly... > > > > > > Buy a small router/modem, ask your ISP for suggestions. > > > This is cheap (<100$), no need to keep your computer always
turned
> > > on, very easy to configure if you nead more features (port > > > forwarding for skype, games, p2p, ....), have some builtint
feature
> > > (dhcp, DNS proxy). Also think about wireless ...... > > > This is probably more secure, not because centos/linux is
not,
but
> > > because you dont know what you are doing. > > > > > > Of course this is less fun > > > > Well, I wasn't going to suggest, but since the topic of
alternatives
> > is open... > > :-) > > Of course the main idea is to avoid to have a non firewall
dedicated
linux
> (like centos is) configured by someone without to much network
knowledge
be > in front of Internet. > > > > > If you have an older available computer laying around, check
out
IPCop
> > > > http://www.ipcop.org/ > > > > free, has lots of features, runs reliably, I've been on it for
years,
> > as have others on this list. Biggest gripe I have is docs
could be
a
> > little better - they tend to not get updated to stay up with
the
software. > > > > > > > > Regards. > > > > > > > > > > > Can anybody help me about IP sharing in Centos? > > > > > > > > thanks alot... > > > > > > > > > > > > -- > > > > Tolun ARDAHANLI > > > > Bilgisayar Muhendisi > > > > E-posta: tolun.ardahanli@linux.org.tr > > > > Icq:326600 > > > > > > > >
> > > > ---------- > > > > > > > > Tolun ARDAHANLI > > > > Computer Engineer > > > > E-mail:tolun.ardahanli@linux.org.tr > > > > Icq:326600 > > > ><snip sig stuff> > > > > HTH > > -- > > Bill > > > > > > _______________________________________________ > > CentOS mailing list > > CentOS@centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > > > -- > Alain Spineux > aspineux gmail com > May the sources be with you > _______________________________________________ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > _______________________________________________ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos >
--
Tolun ARDAHANLI Bilgisayar Muhendisi E-posta:tolun.ardahanli@linux.org.tr Icq:326600
Tolun ARDAHANLI Computer Engineer E-mail:tolun.ardahanli@linux.org.tr Icq:326600 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Alain Spineux aspineux gmail com May the sources be with you
-- Alain Spineux aspineux gmail com May the sources be with you _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Tolun ARDAHANLI Bilgisayar Muhendisi E-posta:tolun.ardahanli@linux.org.tr Icq:326600
Tolun ARDAHANLI Computer Engineer E-mail:tolun.ardahanli@linux.org.tr Icq:326600 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Alain Spineux aspineux gmail com May the sources be with you _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Tolun ARDAHANLI Bilgisayar Muhendisi E-posta:tolun.ardahanli@linux.org.tr Icq:326600
Tolun ARDAHANLI Computer Engineer E-mail:tolun.ardahanli@linux.org.tr Icq:326600 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos