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Status Not under consideration
Workspace AIX
Created by Guest
Created on May 14, 2018

RELATED IDEAS

Stateful filtering in ipsec

we want to achieve stateful filtering along with tunnel (VPN) traffic to be processed by AIX machines.
But ipsec/ipfilter kernel extensions
are replacing each others function address rather than chaining them.
Hence Tom Philip from IBM development support team suggested to open an RFE.

Idea priority High
  • Guest
    Reply
    |     Nov 9, 2022
    IBM has evaluated the priority of this enhancement proposal relative to other future product content and determined that this Idea will not be pursued for a future product release
  • Guest
    Reply
    |     May 30, 2018

    Can we have an update on this RFE?

  • Guest
    Reply
    |     May 18, 2018

    Current limitation of ipsec filtering is:

    >> We need to create 2 different rules for birectional communication to happen. (outbound + Inbound)
    >> Due to this, if we want to allow DNS traffic (for eg.) from an AIX machine, we need to create 2 rules as below:
    ---> # genfilt -v 4 -a P -s 10.1.1.0 -m 255.255.255.0 -d 10.1.1.45 -M 255.255.255.255 -g N -c udp -o gt -p 1023 -O eq -P 53 -r L -w I -l N -f Y
    ---> # genfilt -v 4 -a P -s 10.1.1.45 -m 255.255.255.255 -d 10.1.1.0 -M 255.255.255.0 -g N -c udp -o eq -p 53 -O gt -P 1023 -r L -w O -l N -f Y
    Note: 10.1.1.0 is AIX machine's IP and 10.1.1.45 is DNS server's IP.
    >>There is a potential problem in rule #2, as we are allowing DNS server to access AIX machine's any port (greater than 1023) from its source port 53.

    Advantages of stateful filtering.
    >> This issue can be resolved, if we perform stateful filtering.
    >> In stateful filtering, only rule #1 would help reply traffic(from DNS server to AIX machine) to pass through without the need to rule #2.

    Moreover, NAT functionality is not required currently. It can be optional, but stateful filtering is must for IPSec to handle network traffic efficiently.

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