Snort mailing list archives
Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood
From: Russ Combs <rcombs () sourcefire com>
Date: Fri, 8 Jun 2012 14:06:36 -0400
I'm not sure why you see the flood. It seems like the resets are causing resets, which the code looks out for. Can you send a pcap of the onset of the flood? On Fri, Jun 8, 2012 at 1:32 PM, Gerard Beekmans <gerard () beekmansworld com>wrote:
preprocessor stream5_global: track_tcp yes, \track_udp yes, \ track_icmp no, \ max_tcp 262144, \ max_udp 131072, \ max_active_responses 2, \ min_response_seconds 5 Would removing the max_active_responses make a difference? It doesn't seem to be set incorrectly. I'll give it a try regardless.It could be the cause of the resets.Confirmed. Removing the option made the problem go away. The drop rule still works as planned. I get occasional F flags being sent out now (Fin - end of data) after the rule triggered but nothing to yet worry about. Now the question remains: why would that config option cause the flood and how can it be fixed? From what I understand of it, it's a feature that could be helpful in some situations. Thanks for the help Russ. Gerard
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Current thread:
- A "drop" rule using inline mode and NFQ mode causes an outbound network flood Gerard Beekmans (Jun 07)
- <Possible follow-ups>
- A "drop" rule using inline mode and NFQ mode causes an outbound network flood Gerard Beekmans (Jun 08)
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Russ Combs (Jun 08)
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Gerard Beekmans (Jun 08)
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Russ Combs (Jun 08)
- Message not available
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Russ Combs (Jun 08)
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Gerard Beekmans (Jun 08)
- Re: A "drop" rule using inline mode and NFQ mode causes an outbound network flood Russ Combs (Jun 08)