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58 posts

Master Geek

#90862 1-Oct-2011 07:42
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Hi guys,

I'm struggling with an RTA1320 modem. And no, I can't believe this is a case of the very common overheating problem as I swapped it for a RTA1320e, which died, and then plugged in another RTA1320e, exhibiting exactly the same symptoms.

It suddenly dies (i.e. stops working). I can't telnet to the modem anymore, web interface dead too, and my outgoing ip address has become (probably because it expired?).

This suddenly started to happen since about three days ago. I had the white RTA1320 at that time. I have a couple of spare RTA1320 in case when dies due to overheating, and even some RTA1320E. I plugged in the RTA1320e, but same happened to it. Uptime is only some hours.

So I can't believe it is a hardware problem. As I've used up two RTA1320E as well, which as I understand it, don't suffer from overheating. But what else? Is there some DDoS attack running in the wild???? Got no clue.

Here technical setup details: the RTA1320 runs in half-bridge mode, nothing otherwise enabled on the modem. MTU is 1492. Software version is 3.64y (Had a modem with the Australian 3.65 something as well, stops too). Modem is connected to a FreeBSD server (8.2-STABLE) which handles the firewall (ipfw). My ISP is Vodafone (red network), interleaving is off.

Let me know if more information is needed. I'm getting pretty desparate at this point, so might get something else than an RTA1320. I love those modems as they work very well in half-bridge mode and are pretty cheap to pickup on trademe. As my firewall/qos needs are handled by FreeBSD I don't need anything fancy.

Thanks a lot,


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58 posts

Master Geek

  #527948 1-Oct-2011 07:47
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Here the stats:

Line Mode ADSL2+ Line State Show Time
Line Power State L0 Line Up Time 00:00:19:05
Line Coding Trellis On Line Up Count 1

Statistics Downstream Upstream
Line Rate 20070 Kbps 1209 Kbps
Attainable Line Rate 23519 Kbps 1196 Kbps
Noise Margin 6.1 dB 7.6 dB
Line Attenuation 21.5 dB 9.9 dB
Output Power 18.8 dBm 12.2 dBm
MSGC (number of bytes in overhead channel message) 51 16
B (number of bytes in Mux Data Frame) 220 34
M (number of Mux Data Frames in FEC Data Frame) 1 1
T (Mux Data Frames over sync bytes) 3 3
R (number of check bytes in FEC Data Frame) 0 0
S (ratio of FEC over PMD Data Frame length) 0.3805 0.9929
L (number of bits in PMD Data Frame) 4646 282
D (interleave depth) 1 1
Delay 0 0
Super Frames 70347 71564
Super Frame Errors 2 0
RS Words 0 0
RS Correctable Errors 0 0
RS Uncorrectable Errors 0 0
HEC Errors 1 32761
OCD Errors 0 0
LCD Errors 0 0
Total Cells 54190273 441431984
Data Cells 1387786 314673267
Bit Errors 0 3422542
Total ES 2 2
Total SES 0 0
Total UAS 33 33

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58 posts

Master Geek

  #528880 4-Oct-2011 10:22
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For posterity: I had played with my Cisco SPA 2102 and after reverting my changes to Handle VIA received and Insert VIA received back from "yes" to "no", my modem was stable again.

I still can't believe how this device (it's attached to a switch, which is attached to the server, and only then the traffic goes out over another network card) could possibly have any impact on the modem.

If people can shed any light on this, please. But glad things are stable again.

4065 posts

Uber Geek


  #529232 4-Oct-2011 22:41
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do you have the SIP ALG (SIP application layer gateway) enabled on the RTA? its a piece of tech that 'handles' SIP sessions in a special way, often handling two sip endpoints behind a single publicc ip/nat. some of those ALG implementations tend to be quite cpu intensive, buggy, or both.

If you do have it enabled, try disabling it and messing with your SPA again


58 posts

Master Geek

  #529302 5-Oct-2011 07:48
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Regs: do you have the SIP ALG (SIP application layer gateway) enabled on the RTA?

No, not using the modem at all, as it is running in half-bridge mode it should do absolutely nothing as I understand it, just pass on the packets.

677 posts

Ultimate Geek

  #529313 5-Oct-2011 08:06
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Obvious I know but when swapping the routers are you also swapping AC adapters?


58 posts

Master Geek

  #529363 5-Oct-2011 09:34
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Kraven: Obvious I know but when swapping the routers are you also swapping AC adapters?

Wasn't obviously to me :-) But the 1320E doesn't work with the 1320 AC adapter I quickly found out, so yes, took a 1320E adapter when I swapped to the 1320.

And modem has been up for 4 days now without any glitches (except the issues yesterday with Vodafone's network). 

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