Re: Did MASQUERADE not work ?

["Kevork" <rxlm@xxxxxxxxxxxxxxx>]

The only thing I did not try was SNAT as you advise here ... I will try this
today, but (always there is a "but"), when I post this mail masquering was
not working as I described ... that was yesterday night.

Today morning (no change in the meanwhile), masquering was working  :S

No FORWARD policy is active.
DHCP leasing is OK
I put "-o eth1" also.
$internet is "0.0.0.0/0" (I copy the entire script bellow)

I will try SNAT then, but now I must wait for "not working again"  ... This
has life !  :-))

Thank you all off you for your help ... I will keep you updated about this
fight.

Kevork.

 

----- Original Message -----

From: hclfm@xxxxxxxxxxxx

To: Rob Sterenborg

Cc: 'Kevork' ; netfilter@xxxxxxxxxxxxxxxxxxx

Sent: Wednesday, March 10, 2004 6:13 AM

Subject: RE: Did MASQUERADE not work ?

> Iptables script is the same as when it worked.
> MASQ line is:
> iptables -t nat -A POSTROUTING -s 192.168.250.0/24 -d
> $internet -j MASQUERADE

Hi ,

You have missed the outgoing interface "-o" option ( Internet Interface )

iptables -t nat -A POSTROUTING -o eth1 -s 192.168.250.0/24 -d
$internet -j MASQUERADE

must work.

regards,

U.SivaKumar,
Networking & E-Security,
HCL INFOSYSTEMS LIMITED,

"The Purpose of Computing is Insight, Not Numbers"

"Rob Sterenborg" <rob@xxxxxxxxxxxxxxx>
Sent by: netfilter-admin@xxxxxxxxxxxxxxxxxxx
03/10/2004 08:52 AM CET

To: "'Kevork'" <rxlm@xxxxxxxxxxxxxxx>, <netfilter@xxxxxxxxxxxxxxxxxxx>
cc:
bcc:
Subject: RE: Did MASQUERADE not work ?

> Iptables script is the same as when it worked.
> MASQ line is:
> iptables -t nat -A POSTROUTING -s 192.168.250.0/24 -d
> $internet -j MASQUERADE

What is "-d $internet" ?
If $internet is 0.0.0.0 (as it should be) then you don't need to specify it
as this is assumed.

Did you try SNAT :
iptables -t nat -A POSTROUTING -o <if_inet> \
 -s 192.168.250.0/24 -j SNAT --to-source <ip_inet>

Do you have a FORWARD rule in place that allows MASQ/SNAT, or do you have
FORWARD policy set to ACCEPT (which you should not do) ?

Do you have "echo 1 > /proc/sys/net/ipv4/ip_forward" ?


Gr,
Rob

=