[ILUG] Modifying outgoing packets

[Niall O Broin]

On Wed, Sep 12, 2001 at 12:13:42PM +0100, Adrian Flynn wrote:

> My ISP has moved my mail server which had a public static address, to a
> private address, and set up a NAT on the firewall. This in itself is not a
> problem, but a difficulty arises when my mail server attempts to send mail
> to another NATed mail server within the ISP (many domains). A DNS lookup of
> the MX records returns the public IP address which is unreachable from
> within the private network. As far as I can see, there are a few options:

Perhaps I'm misunderstanding something here, but won't you now have a
problem with ANY mail server in the outside world, all of which will be
unreachable from within the private network ?

Or is it that the NAT configuration allows access to all public IP addresses
except for those for which it is doing NAT ? 

In any event, I'd be bitching at my ISP and looking at my SLA - if the ISP
chooses to rearrange their internal network, this should be done in such a
way that customers are not adversely affected.




Niall