Years ago I recall in my 2G PPP modem days and embedded systems that a PPP session could stay open for maybe a few days but eventually the network would stop talking to the connection, even if there was data flowing over it, so there was code in the system to recycle the PPP instance if the data stopped flowing. This was checked by using a very regular keepalive mechanism. Even if you have keepalives going to try hold the link open it may just fall silent anyway. In your case a modem power cycle might be the only way to get it going again. I suspect the networks might want to stop hogging or blocking of IP/NAT resources in their network and force clients to keep churning their IP and NAT interfaces. Going by old billing details on my phones I suspect just about every time I did something on my phone a new PPP instance was created and then quickly closed or timed out. On 22 June 2017 at 09:22, Mike Everest <mike@duxtel.com> wrote:
Hi Paul,
We've seen lots of reports of this kind of thing. It seems to plague some models more than others (though I have no hard evidence of that I can point to ;) and generally relates to conditions where there is poor or erratic signal. The most effective way to deal with it seems to be use of netwatch to execute usb power-reset on the modem when it fails.
Cheers, Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Paul Julian Sent: Thursday, 22 June 2017 9:16 AM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] Telstra 4G Dropouts
Hi All, we have a number of out of band RB hAP routers out there which have a Sierra Wireless 320U 4G Modem connected to them and use the Telstra 4G LTE network, on the whole these work well, however they regularly, as in once every day or so, stop receiving data, however the LTE interface on the RB does not recognize that there is no data coming in and still thinks it's running and all is good.
I have looked for a keepalive or something for the interface but can't find anything, I don't know if it's a Telstra network issue or the RB or perhaps just how it is but we need these to remain up as much as possible as they are for OOB access to our POP's, has anybody come across this issue before and have any suggestions ?
As soon as you disable the LTE interface and re-enable it things work fine.
I also have an SXT LTE router which does the same thing, so kind of thinking it's not a modem problem as they have the integrated one.
Thanks Paul _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
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