RE: Re: [OT]ish Router +modem problem

["Peter Church" <yahoo@xxxxxxxxxxxxxxxx>]

Thanks all, but I have now found at least a partial solution - I did
some
digging and it appears that other users have experienced problems with the
MTU packet size on my particular 3G router and ISP, and there had been a
hint that adding an extra hop through another router may also cause a
problem.  So I reduced the MTU size slightly to 1400 from 1500 and suddenly
data is flowing.



I haven't sorted out my VPN part but at least this should enable me to
connect to my data logging PC, and from there to Comfort and CCTV.



Thanks



Pete



From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Geoff Hargreaves
Sent: 29 August 2011 20:34
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Re: [OT]ish Router +modem problem





The one thing I do when trying to troubleshoot connection issues, is to
access a remote machne by it's IP address rather than its FQDN. I have a
computer off-site that I can use for this test. If I can get access to
it by using the IP address but struggle or fail when using the FQDN then
this can mean there is a DNS problem somewhere.

I had this exact problem when staying at a hotel in Spain and using
their Wifi connection. I initially put the problem to a bad Wifi or
internet connection but when I got access to my machine via it's IP
address, the connection was good and stable. I ended up using VNC
through an SSH tunnel to my machine in the UK to get anything done.

Geoff

On 29/08/2011 20:06, Peter Church wrote:
> Geoff,
>
>
>
> Yes I have realised the problem of the DynDNS not working and need to
turn
> off - a PC currently does that part.
>
>
>
> Everything else seems the same as yours - I have used the ISP DNS
servers
> and the fixed IP address. It really is quite frustrating!
>
>
>
> I'll try a few more tweaks tomorrow, including turning off the DynDNS
just
> in case that is messing things up somehow..
>
>
> Thanks
>
>
>
> Pete
>
>
>
> From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
] On Behalf
Of
> Geoff Hargreaves
> Sent: 29 August 2011 17:15
> To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> Subject: Re: [ukha_d] Re: [OT]ish Router +modem problem
>
>
>
>
>
> I have a similar setup, except instead of 3g it's an ADSL modem. The
> only thing I have done that is different is to use a static IP address
> for the router WAN and also specify the ISP DNS servers in the router
> instead of pointing to the modem. I also don't use DynDns in the
router
> but instead run it on a PC connected to the LAN.
>
> Geoff
>
> On 29/08/2011 16:41, Peter Church wrote:
>> Yes, my thinking exactly!
>>
>>
>>
>> I might try changing the DNS on the router side to default to the
modem
>> 192.168.2.101 rather than the router to see if it can divert the
traffic
>> directly to the modem (which works when the modem is the
DHCP/default
>> gateway)
>>
>>
>>
>> Any other thoughts?
>>
>>
>>
>> Thanks
>>
>>
>> Pete
>>
>>
>>
>> From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
> [mailto:ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
] On Behalf
> Of
>> Nick Austin
>> Sent: 29 August 2011 15:33
>> To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
>> Subject: Re: [ukha_d] Re: [OT]ish Router +modem problem
>>
>>
>>
>>
>>
>> Hi Peter,
>>
>> The timeout (asterisks) is probably an ISP-owned router configured
not
>> to reply ICMPs. As long as you are getting replies from routers
>> further down the chain it isn't a problem.
>>
>> Also the 90ms+ round trips are typical for 3G broadband so further
>> confirmation that ICMPs are being sent and received over the
Internet.
>>
>> So as I see it a summary so far:
>> DHCP is working
>> DNS is working
>> DNS RELAY is working
>> TRACERT is working.
>>
>> So really I can't see any reason for it not working at all.
>>
>> Nick.
>>
>> On Sun, Aug 28, 2011 at 7:28 PM, Peter Church<yahoo@xxxxxxx
<mailto:yahoo%40petechurch.co.uk>
> <mailto:yahoo%40petechurch.co.uk>
>> <mailto:yahoo%40petechurch.co.uk>
> wrote:
>>> Nick,
>>>
>>>
>>>
>>> Yes the numbers changed slightly as I switched the 3rd digit
of the
>> subnet,
>>> but the problem remains the same.
>>>
>>>
>>>
>>> Here are the results of the Trace Routes:
>>>
>>>
>>>
>>>> tracert -h 4 192.168.1.1
>>>
>>> Tracing route to 192.168.1.1 over a maximum of 4 hops
>>>
>>> 1<1 ms<1 ms<1 ms 192.168.1.1
>>>
>>> Trace complete.
>>>
>>>
>>>
>>>> tracert -h 4 192.168.2.101
>>> Tracing route to e.home [192.168.2.101] over a maximum of 4
hops:
>>>
>>> 1<1 ms<1 ms<1 ms 192.168.1.1
>>>
>>> 2 2 ms 2 ms 2 ms e.home [192.168.2.101]
>>>
>>> Trace complete.
>>>
>>>
>>>
>>>> tracert -h 4 212.58.246.94
>>> Tracing route to bbc-vip015.cwwtf.bbc.co.uk [212.58.246.94]
over a
> maximum
>>> of 4 hops:
>>>
>>> 1<1 ms<1 ms<1 ms 192.168.1.1
>>>
>>> 2 2 ms 1 ms 1 ms e.home [192.168.2.101]
>>>
>>> 3 * * * Request timed out.
>>>
>>> 4 87 ms 88 ms 99 ms 193.120.29.125
>>>
>>> Trace complete.
>>>
>>>
>>>
>>> I also checked this over more hops and it does get there in 13
hops. It
>> is
>>> interesting that the domain name is listed which means DNS is
working,
> but
>> I
>>> guess it is that 3rd hop that is causing the problem. Any idea
what that
>>> means?
>>>
>>>
>>>
>>> I disabled DNS on the modem and gave the router a fixed IP
address and
> the
>>> ISP supplied DNS IPs and the same result occurs.
>>>
>>>
>>>
>>> Out of interest I ran a trace route with the Modem acting as
the DHCP
>> (when
>>> I can get the internet to work) and received this result:
>>>
>>>
>>>
>>> 1<1 ms<1 ms<1 ms e.home [192.168.2.101]
>>>
>>> 2 * * * Request timed out.
>>>
>>> 3 98 ms 99 ms 99 ms 217.112.145.125.gvnx.com [217.112.145.125]
>>>
>>> 4 127 ms 139 ms 138 ms xe1-2-0-10.tcr1.thn.lon.as8218.eu
>>> [213.152.31.16
>>>
>>>
>>>
>>> So it looks like that Time Out is consistent, but not a
killer! Perhaps
>>> interesting that the next hop IP is in a different range to
the others?
>>>
>>>
>>>
>>>
>>>
>>> The current status of the modem is:
>>>
>>> DHCP - Off - fixed IP address
>>>
>>> Firewall - Off
>>>
>>> DMZ - Disabled
>>>
>>> Virtual Servers (port routings) - None
>>>
>>> UPnP - Enabled
>>>
>>>
>>>
>>> Any thoughts?
>>>
>>>
>>> Thanks for your time reading this!
>>>
>>>
>>>
>>> Cheers
>>>
>>>
>>>
>>> Pete
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> ------------------------------------
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
>
> Yahoo! Groups Links
>
>
>





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