Strange behavior with fwaccel dos...

cyberluke365

Greetings!

I'm noticing a strange behavior in our Security Gateways related to fwaccel dos after upgrading from R81.10.

Environment

1 Management (virtual machine) - R81.20 Take 53
2 Security Gateways - R81.20 Take 53

Assuming the enforcement on internal interfaces is disabled and the SecureXL Penalty Box is enabled.

fwaccel dos config get:

rate limit: enabled (without policy)
rule cache: enabled
pbox: enabled
deny list: enabled (with policy)
drop frags: disabled
drop opts: disabled
internal: disabled
monitor: disabled
log drops: enabled
log pbox: enabled
...

The strange behavior: after a while, the enforcement on internal interfaces becomes enabled WITHOUT DOING ANYTHING (internal: enabled). And then, I have to disable it again with fwaccel dos config set --disable-internal. It remains disabled for a while, but then, after a while it becomes enabled again.

Are you also experiencing the same "issue" ? Do you have any advice about the above ?

I also suppose the guide fwaccel dos config (R81.20 Performance Tuning Administration Guide) contains wrong information. On bottom of the article, it is reported:

$FWDIR/conf/fwaccel_dos_rate_on_install:

#!/bin/bash
#
# Automatically generated by fwaccel - DO NOT EDIT THIS FILE
rate.--set-enabled=1
global.--set-enforce-internal=0
pbox.--set-enabled=1
pbox.--set-log-reported=1
deny.--set-enabled=1
drop_frags.--set-enabled=0
drop_opts.--set-enabled=0
global.--set-monitor-only=0
rate.--set-rule-cache=1
global.--set-log-drops=1
...
deny.--set-name=
deny.--set-monitor-only=0
deny.--set-tcp-rst=0
pbox.--set-monitor-only=0

The format of the file fwaccel_dos_rate_on_install (R81.20) is pretty different by the format mentioned in the article
It seems it is not necessary to modify the file fwaccel_dos_rate_on_install in R81.20 for making settings persistent: the file is modified every time the fwaccel dos config set... is launched; and also inside the file there is written "# Automatically generated by fwaccel - DO NOT EDIT THIS FILE"

- I already sent feedback to Check Point about these wrong information -

That's it. I hope someone could help me with first two questions.

PhoneBoy

I suspect what you discovered about the configuration file is related to the problem you're having.
Which means a consult with TAC if you haven't already opened a case.

cyberluke365

Hello @PhoneBoy ,
thank you for your reply. Nope, I didn't opened a case yet (but I'll do that).

What do you mean: the config. file fwaccel_dos_rate_on_install I have in R81.20 shouldn't be in that format (so the article is correct ?) ...Or there is something wrong related to fwaccel dos and config. file in general, in R81.20 ?

Thank you,
Luca

PhoneBoy

I assume it's related to whatever is auto-generating that configuration file.
Can you check the last modified date on that file and see if it tracks when you notice the issue occur?

cyberluke365

Hello @PhoneBoy,

Enforcement on internal interfaces disabled:
-rwxr-x--- 1 **** **** 498 Apr 18 23:34 /opt/CPsuite-R81.20/fw1/conf/fwaccel_dos_rate_on_install

Enforcement on internal interfaces enabled:
-rwxr-x--- 1 **** **** 498 Apr 19 00:08 /opt/CPsuite-R81.20/fw1/conf/fwaccel_dos_rate_on_install

# more $FWDIR/conf/fwaccel_dos_rate_on_install

#!/bin/bash
#
# Automatically generated by fwaccel - DO NOT EDIT THIS FILE
rate.--set-enabled=1
global.--set-enforce-internal=1
pbox.--set-enabled=1
pbox.--set-log-reported=1
deny.--set-enabled=1
drop_frags.--set-enabled=0
drop_opts.--set-enabled=0
global.--set-monitor-only=0
rate.--set-rule-cache=1
global.--set-log-drops=1
...
deny.--set-name=
deny.--set-monitor-only=0
deny.--set-tcp-rst=0
pbox.--set-monitor-only=0

# fwaccel dos config get

rate limit: enabled (without policy)
rule cache: enabled
pbox: enabled
deny list: enabled (with policy)
drop frags: disabled
drop opts: disabled
internal: enabled
monitor: disabled
log drops: enabled
log pbox: enabled
...

Set back to disabled:

# fwaccel dos config set --disable-internal
Configuration saved to /opt/CPsuite-R81.20/fw1/conf/fwaccel_dos_rate_on_install

When the config. file changes (automatically) the output shows the change (of course).

It would be interesting to know what "global.--" prefix in config. file, means.

PhoneBoy

Sounds like a TAC case is in order

cyberluke365

Case opened.

Let's see...

Are you a member of CheckMates?

Strange behavior with fwaccel dos...