Re: Think Broadband Ping Monitor Results (POST YOURS)
 

yeah average is up slightly, spikes are noticebly higher tho so when it does spike it will be more of a jolt if you gaming etc.

cause could be something like a docsis reconfiguration thats bumped up buffer bloat or something like higher utilisation.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

The yellow bit, being the least important aspect of the graph, reminds me of the days that happened practically whenever someone started a torrent

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Having some issues in Plymouth, I'm in the PL6 area.
I've only lived in this area for a month or so, performance does vary.

I managed to change my upstream channel yesterday evening, as I wasn't able to stream anything through the ROKU...
You can clearly see where the upstream change happened, although it improved things, I was only achieving about a 30Mb download speed on a 100Mb connection. Streaming and web-surfing however worked fine...

http://www.thinkbroadband.com/ping/s...21-10-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Definitely an improvement but I'm not willing to say "fixed" just yet. How about some modem stats and we'll see if anything is amiss?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Brighton:

https://www.cableforum.co.uk/images/local/2016/02/7.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Surprised Virgin are claiming nothing was wrong that affected us all in East Anglia!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Just shows their contempt !

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Can you point me to the relevant thread in the VM forum please?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Thanks Seph

http://community.virginmedia.com/t5/...2030424#M31267

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I've now seen Ralph's report. It seems they're saying that as things are OK now, it'll be hard to squeeze anything out of networks to say what happened.

I didn't quite read it as "nothing wrong". More like a mystery to Ralph but networks know what it was!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Wonder if it was a case of someone unplugging a switch to charge their phone and forgot to switch it back on or similar! ;)

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

As much as I like those sorts of jokes myself, I should point out that switches and phones use completely different power plugs, you can't shove a phone charger in a switchs' power outlet. At least not if your datacentre is wired properly.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Depends on the switch. Would it be THAT surprising for Virgin to be using a bog standard TP-link gigabit switch somewhere? :P

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

To be honest, incompetent as VM can be, yes that would be surprising. They seem like a company more inclined to leave things broken than to apply quick and dirty fixes.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I'm astonished at that remark (if I've understood it correctly). The switches used by VM in their core are proper high throughput, high resilience devices, with fibre trunks etc. It wouldn't be possible to include a low grade switch in the network.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Thanks for your reply, as requested attached are my statistics.

Even though I've changed upstream channel, performance does vary allot.
Here is my latest TBB graph:
My Broadband Ping

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

What exactly do you imagine is the difference between a "high throughput" gigabit switch and an "ordinary" gigabit switch, considering both throughput data at exactly one gigabit?!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Stop nitpicking. I didn't mention Gigabit - Kush did. And you know exactly the point I was driving.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

You're implying there's a difference. There isn't. Virgin Media use tons of gigabit switches throughout their network, I'd say the majority of ports would probably be gigabit. How are they any more "high throughput" than an ordinary gigabit switch with the same throughput?

Stop pulling the "stop nitpicking" get-out out of your arse every time you're incapable of actually participating in a debate when you get pointed out for saying something wrong.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

You just go for nitpicking. It's your trademark. I said nothing wrong whatsoever. You just made up an extension for the sake of nitpicking. You can be more constructive than that.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Jesus guys, it was just a joke. Put the handbags away.

---------- Post added at 19:40 ---------- Previous post was at 19:39 ----------

Your stats are reasonable. Not amazing, but within spec sort of thing. Your graph is about the same - could be a lot better and I suspect something is going on, perhaps Seph or someone else would be better to speculate as to what.

You are only on one upstream channel though, perhaps it's just a bit of congestion and when you get your second, you'll hopefully see an improvement.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

You was nitpicking and being pedantic about kushans jokey comment but cry when someone does the same to you? Hypocrisy at it's finest.

Will rebooting the shub until a different upstream is connected belp at all?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Anyone else get a 'hill' from midnight to 12:30am this morning?

[img]Download Failed (1)[/img]

Ignore the red line, rebooted the Superhub as it just started its 9th day uptime.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I didn't get anything here.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Nope,

http://www.thinkbroadband.com/ping/s...26-10-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Yes got it too

https://www.cableforum.co.uk/images/...2013/12/18.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Wonderful stuff

http://www.thinkbroadband.com/ping/s...01-11-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Brighton.


http://www.thinkbroadband.com/ping/s...02-11-2013.png


R.egards

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Looking good in Cambridge CB24, now on 8 downstreams and 2 upstreams with SH2.

[img]Download Failed (1)[/img]

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Did anyone else get a bump at 3am?

http://www.thinkbroadband.com/ping/s...15-11-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Ooops

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

http://www.thinkbroadband.com/ping/s...16-11-2013.png

Looking quite bad :(
According to my router, approx 10Kbit/sec being transferred so not sure why its gone to hell

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

No "spike" at 03:00.

http://www.thinkbroadband.com/ping/s...15-11-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

http://www.thinkbroadband.com/ping/s...14-11-2013.png
Seems healthy eh :erm:

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

My shub2 in router mode

https://www.cableforum.co.uk/images/local/2013/11/6.png

Its not needed to be rebooted in ages

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

https://www.cableforum.co.uk/images/local/2013/11/3.png

No idea what's been going on since midnight, the red spike around 1am I couldn't access any sites for around 10 minutes though it seemed to be an issue elsewhere on the network as the modem did not lose connection. Looks like it recovered some after 10am but the ping is still not as low as it was before.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Have you received any updates? Has anything else changed?

If you are on superhub in full mode, internet disconnects will not have affected you home network.

I guess your conection has been taken offline twice either because of a fault or because of upgrades to the local connection or your firmware.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

They might have been mucking around with upstream modulation like moving from 16QAM to 64QAM. Upstream stats might show this - or not as the case may or may not be!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

^^ Modem stats are unchanged from before, what ever it is it doesn't appear to be local but maybe VM's core network. ping still hasn't recovered fully on the graph but it isn't as bad as before.

In real world usage it doesn't seem that bad, it's just a cosmetic thing with the graph I guess but then it isn't affecting other VM graphs from what I can see (though the 2am red spike was).

https://www.cableforum.co.uk/images/local/2013/11/2.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

[img]Download Failed (1)[/img]

Nottingham sh in modem mode, quite a few random bits of p/l

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Anyone else have a spike in minimum latency around midnight and 8-9pm last night?

http://www.thinkbroadband.com/ping/s...30-11-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Mine has now gone pear shaped. It's been running fine for weeks. currently on 120mb in Warwickshire...

http://www.thinkbroadband.com/ping/s...01-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

That could be upstream noise causing the packet loss. We would need to see your upstream and downstream modem ststs, asking you to tell us if the upstream power level is stable or moving up towards 55 dBmv.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Snap! :)

http://www.thinkbroadband.com/ping/s...27-11-2013.png

Glasgow.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Hint of a snap at 2 am. The others were short outages and the last one me rebooting
http://www.thinkbroadband.com/ping/s...27-11-2013.png
... and again at 2 am.
http://www.thinkbroadband.com/ping/s...02-12-2013.png

They must use 2 am. as a good time to reboot stuff.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Moi aussi.

http://www.thinkbroadband.com/ping/s...27-11-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Nothing here:

http://www.thinkbroadband.com/ping/s...03-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Nothing here either.

http://www.thinkbroadband.com/ping/s...03-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Nothing for me today either, perhaps the engineers are taking a day off:

https://www.cableforum.co.uk/images/...2013/12/22.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I don't really know how to interpret these graphs. Is this okay? What are the yellow spikes during the day but not at night? I haven't downloaded anything. Thanks for your help

https://www.cableforum.co.uk/images/...2013/12/21.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

ANy spikes when you're doing nothing is likely to be the effects of others doing stuff on your node - most likely uploading.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Were you using the connection at all?

You don't have to be "downloading" anything. Browsing the web or even turning on your computer does "downloading" in itself.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Anyone else get a lovely plateu at about midnight last night?

http://www.thinkbroadband.com/ping/s...16-12-2013.png

This could have been me, I vaguely remember turning on Google+ photo sync at around that time and it found a few (thousand) photographs to upload, but I didn't think my phone could cause that much of a spike.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Uploading on VM is very likely to cause big latency spikes. Welcome to bufferbloat.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Possibly, I do a fair bit of uploading anyway though but there was a lot of data to upload. I'm not bothered, I was asleep at the time. As long as it works when I need it, I cannot complain!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Ref:

Anyone else get a lovely plateu at about midnight last night?

Was that the Price increase? (Why was the notification letters writing so small ?)



https://www.cableforum.co.uk/images/local/2016/02/7.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

#1 Son's on 120Mbps My own on VM were substantially worse than this

http://www.thinkbroadband.com/ping/s...26-12-2013.png

Mine since swap to FTTC

[img]Download Failed (1)[/img]

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

[img]Download Failed (1)[/img]


My internet has been like this since sunday afternoon. Keeps cutting out so cant netflix without being interrupted. Got a virgin engineer coming on Saturday hopefully he can fix it. Actually it's either the superhub needing to be replaced of theres a problem on the network. I really hope its a superhub issue. I

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Get the engineer to replace it anyway, if you can. Someone mentioned that SH1's aren't even carried any more, so you should get a SH2 (assuming they've run out of SH1's).

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Will do Kushan

These are my graphs since the 22/12/2013

http://www.thinkbroadband.com/ping/s...22-12-2013.png

http://www.thinkbroadband.com/ping/s...23-12-2013.png

http://www.thinkbroadband.com/ping/s...24-12-2013.png

http://www.thinkbroadband.com/ping/s...25-12-2013.png

http://www.thinkbroadband.com/ping/s...26-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

What are your modem stats?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Downstream
DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 282750000 Hz 290750000 Hz 298750000 Hz 306750000 Hz 314750000 Hz 322750000 Hz N/A N/A
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked N/A N/A
Channel ID 97 98 99 101 102 103 N/A N/A
Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 N/A N/A
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 N/A N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 N/A N/A
Power Level (dBmV) 1.9 dBmV 1.8 dBmV 1.6 dBmV 1.3 dBmV 2.7 dBmV 2.8 dBmV N/A N/A
RxMER (dB) 43.9 dB 43.9 dB 43.9 dB 43.9 dB 44.6 dB 43.9 dB N/A N/A



Upstream
US-1 US-2 US-3 US-4
Channel Type 2.0 2.0 N/A N/A
Channel ID 1 3 N/A N/A
Frequency (Hz) 45800000 Hz 27400000 Hz N/A N/A
Ranging Status Success Success N/A N/A
Modulation QAM16 QAM16 N/A N/A
Symbol Rate (Sym/sec) 5120000 5120000 N/A N/A
Mini-Slot Size 128 128 N/A N/A
Power Level (dBmV) 41.0 dBmV 39.3 dBmV N/A N/A
T1 Timeouts 0 0 N/A N/A
T2 Timeouts 0 0 N/A N/A
T3 Timeouts 324 324 N/A N/A
T4 Timeouts 19 19 N/A N/A



Upstream keeps changing when the internet disconnects. I've taken screen shots of this to show the engineer

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Hmm, those levels actually look all right at first glance, but you're getting loads of T3 and T4 timeouts so yeah, definitely a network issue. I'm not sure what a tech is going to be able to do but it'll get sorted soon enough hopefully.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Nice... what speeds you getting?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

http://www.thinkbroadband.com/speedt...6513368264.png

Looks like my son has some SNR issues leading to the packet loss. His SH1 goes to rats after a few days anyway and needs rebooting to cut down on jitter. Power is on the high side too but mine ran at same sort of level OK.

Lock Status Channel ID Frequency Modulation Rx Power SNR Pre RS Errors Post RS Errors
Locked 69 427000000 Hz QAM256 6.4 dBmV 29.9 dB 247072173 38813
Locked 70 435000000 Hz QAM256 6.7 dBmV 30.5 dB 55455293 38060
Locked 71 443000000 Hz QAM256 6.5 dBmV 31.1 dB 8510418 35730
Locked 72 451000000 Hz QAM256 6.4 dBmV 31.6 dB 1704651 33764
Locked 73 459000000 Hz QAM256 6.1 dBmV 43.5 dB 7210 2
Locked 74 467000000 Hz QAM256 6.1 dBmV 43.6 dB 6532 0
Unlocked Unknown 0 Hz Unknown 0.0 dBmV 0.0 dB Unknown Unknown
Unlocked Unknown 0 Hz Unknown 0.0 dBmV 0.0 dB Unknown Unknown

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Mines been pretty uneventful

http://www.thinkbroadband.com/ping/s...27-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Wish I could say the same.

Had my trial SH2 Modem Mode (signal levels spot on) replaced with new SH2 Modem Mode (signal levels spot on) last week - not that anyone was expecting it to make a jot of difference. This has been going on since September and no sign of any improvement whatsoever. Looks like network problems in the Hemel/Luton area as the Luton VM server on speedtest can't even return decent figures. VM Forum team say there is a Network fault that has been partly addressed, but work is still continuing. CS says network fault is not affecting me. So where does the truth sit, I wonder? Oh yes, and Tivo can't manage to get a netflix stream above about 380 lines in the evening either.

http://www.thinkbroadband.com/ping/s...27-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I recall in the SH2 trial that many people reported regular ping spikes in their TBB charts, I've trawled through the trial posts, but can't find the thread about this behaviour, and as I didn't have this with my original SH2 during the trial it wasn't one of my regular threads.

With my replacement SH2 I am getting regular maximum spikes every 15 minutes. Can anyone remember what was the cause of the regular spikes and what was the cure please?

120Mbs service, JDAST averages 71Mbps down, 4.6Mbps up, but with evening performance dropping to less than 10Mbps down and 2Mbps up. Power and noise levels all within acceptable ranges. Running in modem mode, up for 5 days, pre/post RS values quite high, pre:10000 to 18000, post: 7500 to 8500 but not increasing.

Apart from JDAST, what other regular monitors do people run to record network performance over time?

http://www.thinkbroadband.com/ping/s...04-01-2014.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I gave up using JDAST when VM provided seers on speed test.net. The only problem I had with JDAST was a dubious upload site that I could not change. So I couldn't trust the upload figures.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Is there anyway to automate speedtest.net to record on a regular basis?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I think TBB has a speed monitor program you can download and use?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Mine went very messy looking since around Christmas.

http://www.thinkbroadband.com/ping/s...04-01-2014.png

http://www.thinkbroadband.com/ping/s...05-01-2014.png

Quite a difference when comparing to early December.
http://www.thinkbroadband.com/ping/s...05-12-2013.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Thanks I'll take a look...

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

http://www.thinkbroadband.com/images.../toothcomb.png

http://www.thinkbroadband.com/faq/sections/bqm.html

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Thanks. A useful link.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

ok, dang...look at this s**t.....no wonder my connection is all over the place!

[img]Download Failed (1)[/img]

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Look's fine.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Really? my "average" latency is off the chart! I usually get a low green latency (as expected, then slightly higher blue showing that average isn't much higher than minimum.....but not here!

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Sorry, that was meant to be sarcasm. It's ****ed. Modem stats?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Kushan...apologies....my sarcasm detector is offline currently...much like my feckin internet service :)

What modem stats.....been ages since I had to fiddle with anything. Superhub used as Modem only. Point me in the right direction mate.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Go to http://192.168.100.1 and there should be an option for Modem stats somewhere (Not got a SH1 myself, but on the SH2 it's the top right).

We need to see the downstream and upstream statistics.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I can't see any stats as SuperHub doesn't act as a router for me, just a modem. so that's out...any other ideas pal?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

It's the router status link at the top right hand corner of the sign-in screen.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

As suggested providing you're not accessing remotely then you'll find a Router Status on top RH corner BEFORE you attempt to Signin - what happens if you you try: http://192.168.100.1/RouterStatus.html ?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

ahh gotcha...do you know I've managed never to look at that. Right, any specific stats to check for?

---------- Post added at 15:36 ---------- Previous post was at 14:57 ----------

Did another reboot recently and I've left it for a bit and checked my graph, and the blue is TINY....perhaps a corruption in a routing table or something....christ knows. What should I be looking at in the stats though?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Downstream and Up[stream and Operational Config

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Indeed, but in terms of signal/power levels etc..

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Everything you see in those categories. Just copy/paste into your next reply..

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

This is weird. I have full internet services. Speed test at 126Mb, yet a graph like this. I disabled this monitor, but the system won't let me create another. It says I am already monitoring this IP address.


http://www.thinkbroadband.com/ping/s...09-01-2014.png

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

ICMP passthrough enabled on the router?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

I haven't got network filter services switched on. Also all NAT passthroughs are enabled.

I've just traced problem back to the day I updated ASUS N66U firmware to latest revision. So what's changed I wonder? Last Saturday.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

You do NOT want passthrough, you want firewall allow and respond.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Er. Going with what you said for now, rather than Seph.

What will have changed with the firmware update and where in the router firewall would I gain 'allow and respond'?

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Normally you have to enable allow wan ping request option as its often turned off by default settings.

On my Asus RT-N56U its labelled as "Respond Ping Request from WAN?" under firewall settings. So set this to enabled and the graph should start to work.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

OK! Thanks. Done that.

Weird that the setting must've changed with the update. I don't recall enabling it 9 months ago when I first got this router. Perhaps I did.

I should be able to tell in about 30 minutes if this has worked.

Edit.............................................. .................................

Working. (See above) Thanks again.

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

Yeah some people/companies/manufacturers/PR jerks seem to think not responding to pings from the internet is a "security feature".

Re: Think Broadband Ping Monitor Results (POST YOURS)
 

There is such a thing as an ICMP flood, so I can see why that might be. Still, rather than just not responding at all, it's the kind of thing a good firewall should prevent.