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From: Carsten Maass <cm@blinkenlichten.de>
To: netfilter@lists.netfilter.org
Subject: INET_IFACE: Secure to allow traffic from 192.168.x.0/24?
Date: Thu, 04 Mar 2004 13:29:25 +0100	[thread overview]
Message-ID: <40472125.4000608@blinkenlichten.de> (raw)

Dear List,

recently i connected together two internal networks over an IPSec-tunnel:

(Localnet A)---(Gateway A)==IPSec==(Gateway B)---(Localnet B)

Now i am unsure which iptables-rules i should apply to the external 
interfaces of the gateways to match the traffic between the Localnets 
without opening up a security hole. Is it sufficient to simply apply 
some general rules like:

$IPTABLES -A FORWARD -i $INET_IFACE -s 192.168.a.0/24 -j ACCEPT
$IPTABLES -A FORWARD -i $INET_IFACE -s 192.168.b.0/24 -j ACCEPT

or would this approach be vulnerable to some kind of IP-spoofing attack? 
What would be your solutions in this situation?

Thanks for your help,
Carsten.



             reply	other threads:[~2004-03-04 12:29 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-04 12:29 Carsten Maass [this message]
2004-03-05  1:29 ` INET_IFACE: Secure to allow traffic from 192.168.x.0/24? Antony Stone
2004-03-05 11:28   ` Carsten Maass
2004-03-05 11:40     ` Antony Stone

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