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Author Topic: TCP Wait Time  (Read 2607 times)

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Offline jp.briggs

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TCP Wait Time
« on: June 18, 2013, 11:59:08 AM »
During a security audit, I was asked how we establish a maximum wait time for TCP connections (to avoid SYN-flood DoS attacks), and I had to answer that I'm not sure that we can.

Looking at Cisco, it appears you can use ip tcp synwait-time to set such a setting.

We have a mix of 8600s, 8300s and mostly 5520s in our environment.

The text from the requirement:
The network device must be configured with a maximum wait time of 10 seconds or less to allow a host to establish a TCP connection.
Configure the maximum wait time for TCP connections to be established with the device to 10 seconds or less.

Any insight to this?

Thanks,



Offline Michael McNamara

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Re: TCP Wait Time
« Reply #1 on: June 18, 2013, 03:22:15 PM »
You'll need to take that question to Avaya support.

I don't believe those low-level configurations are available, although I know Avaya has quite a few government contracts so there's probably some response.

Good Luck!
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Offline Telair

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Re: TCP Wait Time
« Reply #2 on: June 20, 2013, 11:27:02 AM »
I would think those settings would be for a firewall, not a network switch or router.  Switches and routers don't typically deal with watching TCP connections, they just pass it through to it's destination.