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Date:      Tue, 01 Jul 1997 22:56:41 +0100
From:      Brian Somers <>
To:        Sergey Pukach <>
Cc:        freebsd-questions@FreeBSD.ORG,,
Subject:   Re: Security hole ? 
Message-ID:  <>
In-Reply-To: Your message of "Tue, 01 Jul 1997 22:13:58 +0300." <> 

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> Hi.
> I have two ISP, one of which running FreeBSD and assign static IP
> to all users. For connection I'm using ppp by Toshiharu OHNO.
> Playing wiht /etc/ppp/ppp.conf I'm found amazing (for me) feature.
> This is string from ppp.conf:
> add ifaddr a.b.c.d  0
> So, remote server can use any IP and my IP should be a.b.c.d
> If instesd of a.b.c.d I substitute real IP of one of my ISP server
> I can declare myself as another machine. During such connection
> I have received a lot of mail which is not intended to be mine.
> I think skilful hacker can use this in another way. So, how
> ISP can avoid such unproper connections?

Your ISP should specify

 set ifaddr x.x.x.x a.b.c.d

thus disallowing you from being anything but a.b.c.d.

> pss
> // Sergey Pukach
> //

Brian <>, <>
Don't _EVER_ lose your sense of humour....

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