Re: Log flooded with "(decode) same src/dst IP"

Have you tried commenting out this line "--enable_builtin_rules = true,"? Its under the IPS section of the config file..

"    -- use this to enable decoder and inspector alerts
    --enable_builtin_rules = true,
"


Albert Lewis

ENGINEER.SOFTWARE ENGINEERING

SOURCEfire, Inc. now part of Cisco

Email: [email protected]<mailto:[email protected]>

________________________________
From: Snort-users <[email protected]> on behalf of Amish via Snort-users <[email protected]>
Sent: Tuesday, November 15, 2022 2:31 AM
To: [email protected] <[email protected]>
Subject: [Snort-users] Log flooded with "(decode) same src/dst IP"

Hello

Recently I upgraded from snort 2 to 3.

I am using snort 3.1.45 in NFQUEUE (IPS) mode.

The snort is installed on gateway and monitors all traffic to and fro LAN.

I use snort-community rules, installed via pulled pork 3.

I also use latest OpenAppID.

I noticed that the log file (alert_fast) gets flooded with following lines:

11/15-12:38:25.616624 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586
11/15-12:38:25.618817 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586
11/15-12:38:25.620745 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586
11/15-12:38:25.622575 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586
11/15-12:38:25.623990 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586
11/15-12:38:25.625335 [**] [116:151:1] "(decode) same src/dst IP" [**]
[Priority: 3] [AppID: SQL Server] {TCP} 192.168.1.151:1433 ->
192.168.1.151:58586

This occurs because 192.168.1.151 connects to its own public IP which
gets redirected back to 192.168.1.151 via NAT.

So how do I disable this rule? Grepping for "same src" in snort.rules
file gives nothing.

So I have no clue where the rule is located. It filled up 200GB of
harddisk in less than 15 days.

Can someone give pointers?

Thank you,

Amish.

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