[Chilli] Best way to enforce MTU 1480?

[Derek Conniffe]

Hi Ben,

I use a MESH as well (with UBNT M radios & ATH9K with an AdHoc VAP) but 
what I did was set the MTU of the MESH I/F to something like 1528 so 
that standard (1500) packets get though OK.  Last year I was trying to 
clamp MTU on a couple of I/Fs (for a different reason - it was on an EC2 
instance with VPN & Squid and not MESH related) and it nearly broke my 
spirit and cost me a couple of days in hair-pulling!

Derek

On 27/03/2014 20:52, David Bird wrote:
> The MTU option will send the MTU value in DHCP, but doesn't mean it's 
> always respected. You might refer to 
> http://lartc.org/howto/lartc.cookbook.mtu-mss.html
>
>
> On Thu, Mar 27, 2014 at 12:30 PM, Ben West <ben at gowasabi.net 
> <mailto:ben at gowasabi.net>> wrote:
>
>     I'm running coovachilli v1.3.0 under OpenWRT AA on Ubiquiti
>     Nanostation gear, with only 32Mbytes of RAM. Since these are nodes
>     in a mesh managed by OLSR, I need to enforce MTU=1480 for all
>     client sessions authorized by chilli.
>
>     From the online Changlog, it appears I can do this by adding a
>     parameter to the start-up command in coovachilli's init script:
>
>     /usr/sbin/chilli --mtu 1480
>
>     However, the tap interface which I believe is what chilli sets up
>     to manage bandwidth throttling on client sessions still reports
>     MTU 1500:
>
>     tun0      Link encap:UNSPEC  HWaddr
>     00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>               inet addr:101.232.44.1 P-t-P:101.232.44.1 
>     Mask:255.255.255.0
>               UP POINTOPOINT RUNNING  MTU:1500  Metric:1
>               RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>               TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>               collisions:0 txqueuelen:100
>               RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
>     ... where 101.232.44.1 is the NAP IP of the device where I quoted
>     this from.
>
>     Is there a way I can ensure proper MTU settings on chilli client
>     sessions?
>
>     -- 
>     Ben West
>     http://gowasabi.net
>     ben at gowasabi.net <mailto:ben at gowasabi.net>
>     314-246-9434 <tel:314-246-9434>
>
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>
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