[Cerowrt-devel] fixing reboots behind comcast modems

[Aaron Wood]

I've not had to reboot my modem (SB6141) when rebooting my WRT1900AC
(running stock fw, OpenWRT, or LEDE).  I always have to reboot the SB if I
change the router out (different MAC).

I've had the same experiences with all the Surfboard-line modems I've had
in the past (going back to 2004).

-Aaron

On Wed, Feb 8, 2017 at 7:46 AM, Dave Taht <dave.taht at gmail.com> wrote:

> I finally found what seems to be a fix for rebooting a
> cerowrt/openwrt/lede  box behind a comcast cablemodem
>
> I'd put "broadcast" in the uci config file, that didn't help.
>
> After googling a bit, someone suggested adding
>
> --retries=2 --timeout=5 --tryagain=310 to the
>
> /lib/netifd/proto/dhcp.sh invocation...
>
> And that worked, after a few minutes. I'm irked enough to poke at it
> harder, but I'm curious if anyone here had come up with a solution?
> (I'd actually always assumed it was a quirk in my particular brand of
> cablemodem, but I got a new one, and it did the same thing)
>
> https://plus.google.com/u/0/107942175615993706558/posts/Z5CD63e5kmt
>
> That said, I'm irked enough at it, and at how long it takes, to poke
> into it harder (lots of reboots here of late), the best idea I can
> think of is to have udhcpc have an option to save the last xid and ip
> info to flash and always start in a renew state, using that. The
> modems tend to offer a 192.x for about a minute when they boot, tho,
> so I guess we'd defer writing that until it had been stable for an
> hour.
>
> --
> Dave Täht
> Let's go make home routers and wifi faster! With better software!
> http://blog.cerowrt.org
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> Cerowrt-devel at lists.bufferbloat.net
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>
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