nanog mailing list archives
Re: Emulating a cellular interface
From: Mikael Abrahamsson <swmike () swm pp se>
Date: Sat, 6 Nov 2010 07:09:41 +0100 (CET)
On Sat, 6 Nov 2010, Saqib Ilyas wrote:
A friend of mine is doing some testing where he wishes to emulate a cellular-like interfaces with random drops and all, out of an ethernet interface. Since we have plenty of network and system ops on the list, I
I would say that a cellular interface doesn't really have random drops, then there is something wrong with it (at least if it's UMTS). A UMTS network has RLC re-transmits all the way between the RNC and the mobile terminal.
This means that a UMTS network has more characteristics of packet flow, stalls for hundreds of milliseconds or seconds (or even minutes, my record is 240 seconds), and then a burst of packets. Very jittery, but very low rate of packet loss.
Also, the terminal might go down in "idle", meaning that if you send a packet to it, it'll take 1-2 seconds for it to come out of idle, cellular resources allocated, and then the packets start flowing.
I don't have a good idea how to emulate this, the tools I've seen so far usually just emulate jitter, delay and packet loss, and not really the above behaviours.
-- Mikael Abrahamsson email: swmike () swm pp se
Current thread:
- Emulating a cellular interface Saqib Ilyas (Nov 05)
- Re: Emulating a cellular interface Mikael Abrahamsson (Nov 05)
- Re: Emulating a cellular interface Andrew Kirch (Nov 05)
- Re: Emulating a cellular interface Saqib Ilyas (Nov 05)
- Re: Emulating a cellular interface Andy Davidson (Nov 06)
- Message not available
- Re: Emulating a cellular interface Suresh Rajagopalan (Nov 06)
- Message not available
- Re: Emulating a cellular interface Adrian Chadd (Nov 06)
- Re: Emulating a cellular interface Henry Linneweh (Nov 10)
- Re: Emulating a cellular interface Saqib Ilyas (Nov 11)