ASA 5510 running out of 1550 byte blocks

geert.veenstra · ‎08-25-2011

Hi,

I am having trouble with our ASA5510.

After upgrading the internal memory from 256 MB to 1 GB and upgrading the firmware to 8.4.2 we are experiencing that the ASA is running out of 1550 byte blocks. When that happens it is not possible to connect to the ASA by ADSM or SSH and new VPN IPSEC tunnels are not coming up.

The only way I know how to fix this is to reload the ASA. This is happening every 2 to 3 days.

In the free blocks graph one can see that there is a loss of about 20 blocks per 10 minutes.

What are the steps I can take to find out what is causing this?

Or is it a bug maybe ?

Regards,

Geert Veenstra

varrao · ‎08-25-2011

Hi Geert,

I wodl suggest you to open a TAC case for it, since this might require detailed investigation into it, even if it is hitting a bug. Outputs needs to be collected from the firewall to ensure any memory leaks on the ASA.

Thanks,

Varun

Thanks,
Varun Rao

alonciscoadv · ‎12-11-2011

it's hitting a bug - bud ID CSCto774092. look in bug toolkit

Julio Carvajal · ‎12-11-2011

Hello Geert,

Just to add to what Alon said, it is definetly a bug, I have worked on some cases with this issue after an upgrade to

8.4.2,

I will give you some more information on this on Monday,

Have a wonderful Sunday.

Julio!!

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC

Julio Carvajal · ‎12-12-2011

Hello Alon,

Here is the exact bug ID you are facing:CSCto74092

ASA 1550 byte block depletion causing traffic failure

The bug is still open so I would recommend you to downgrade to 8.4.1(11) because at this moment the bug still being worked on.

Regards,

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC

PaulSparkes · ‎07-03-2013

Hello I am having this problem too and am on version 9.1(1)8

I have opened up 3 separate TAC cases it’s not fixed yet...

It appears to be a re-occurring issue as there has been quite a few iOS releases that have fixed this issue.

Mine happens every week so not as often but means I have to reboot the ASA twice a week out of hours to stop it crashing inside of office hours.

Any suggestions on where to start looking?

Jouni Forss · ‎07-03-2013

Hi,

Think we had this bug in ASA5585-X SSP20 running 8.4(2)

It was running around 100 Security Contexts.

One of them had a "logging" configurations that pointed to a Syslog server. However the interface IP address was missing from the interface. (Probably configuration was "dropped" to the firewall which had overlapping IP address with other context and command was ignored)

This seemed to cause the ASA to eventually run out of resources and reboot

To my understanding nothing more was done in our case other than configure the IP address under the interface. Though I would imagine that this shouldnt be happening even if the IP address was missing from the interface and there was an existing "logging" configuration.

Somehow I think this probably is not what you are facing.

- Jouni

PaulSparkes · ‎07-03-2013

Hello Jouni,

Syslogging was disabled before we started having the issue :-( just checked all the firewall rules have logging disbaled as well as I only turn the logging on for troubble shooting when something is getting blocked.

Just went through the logging settings and they all seem ok, 4096 Bytes for the internal buffer (100 queue) and only the ASDM log is enabled and set to Notifications

Kind Regards

Paul

PaulSparkes · ‎07-03-2013

All interfaces and sub interfaces have IP addresses assigned.

PaulSparkes · ‎07-03-2013

Call me sad but I've downloaded a copy of the packets using

show blocks old dump | b size 1550

There doesn't seem to be a single type of traffic, IE I've got DFS Replication packets going over a VPN and normal HTTP traffic getting stuck (***** = name of the DFS server) and there was a few others I've seen but no real link between them.

Packet contents:

-----------------------------------------------------------+------------------

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0xa69fcb34: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................

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Packet contents:

-----------------------------------------------------------+------------------

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0xa6a02994: a4 4c 11 77 0e 3f 08 00 45 a0 00 78 7e 35 00 00 | .L.w.?..E..x~5..

0xa6a029a4: 40 32 0c 2d b0 38 d4 be d9 c8 a4 4c 11 77 0e 3c | @2.-.8.....L.w.<

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-----------------------------------------------------------+------------------