[isalist] Re: Spoofing - ISA 2006 SP1
- From: Jim Harrison <Jim@xxxxxxxxxxxx>
- To: "isalist@xxxxxxxxxxxxx" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 11 Aug 2008 22:22:46 -0700
http://www.ISAserver.org
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Don't use the same network range for VPN and internal networks.
This isn't new since SP1.
-----Original Message-----
From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On
Behalf Of Raji Arulambalam
Sent: Monday, August 11, 2008 10:17 PM
To: [ISAserver Discussion List]
Subject: [isalist] Spoofing - ISA 2006 SP1
http://www.ISAserver.org
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Hi
I am getting these messages since applying SP1.
This is for incoming VPN connections that get their IP# assigned from DHCP from
the internal network.
The ISA servers' internal network addresses is also 172.16.90.0/24
How do I fix this? Would I exclude these ip# range from the internal network
addresses?
Cheers
Raji
......
Description: ISA Server detected a spoof attack from Internet Protocol (IP)
address 172.16.90.4. A spoof attack occurs when an IP address that is not
reachable via the interface on which the packet was received. If logging for
dropped packets is set, you can view details in the firewall log.
Description: ISA Server detected routes through the network adapter Internal
NIC 172 net that do not correlate with the network to which this network
adapter belongs. When networks are configured correctly, the IP address ranges
included in each array-level network must include all IP addresses that are
routable through its network adapters according to their routing tables.
Otherwise valid packets may be dropped as spoofed. The following ranges are
included in the network's IP address ranges but are not routable through any of
the network's adapters: 172.16.90.4-172.16.90.4;. Note that this event may be
generated once after you add a route, create a remote site network, or
configure Network Load Balancing and may be safely ignored if it does not
re-occur.
The routing table for the network adapter Internal includes IP address ranges
that are not defined in the array-level network VPN Clients, to which it is
bound. As a result, packets arriving at this network adapter from the IP
address ranges listed below or sent to these IP address ranges via this network
adapter will be dropped as spoofed. To resolve this issue, add the missing IP
address ranges to the array network.
The following IP address ranges will be dropped as spoofed:
Internal:172.16.90.4-172.16.90.4;
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