[Spce-user] UDP packet size

[Nikita Stashkov]

Ok, thank you.

So, my diagnosis was correct - this is packet size.
I tried on a public HotSpot, 3G connection - the same issue.
So, can we make a conclusion that UDP is not recommended for home and public networks?

Regards,
Nikita Stashkov

05 марта 2014 г., в 13:55, Andreas Granig <agranig at sipwise.com> написал(а):

> Hi,
> 
> Please keep the list in CC for any non-privacy-critical things, we're
> not doing private email support.
> 
> Alright, the second INVITE indeed exceeds typical MTU sizes (usually
> 1400 byte, you're at 1540) according to your client log:
> 
> On 03/05/2014 01:42 PM, Nikita Stashkov wrote:
>> channel [0x2d3d000]: message sent to [UDP://sipmobile.org:5060], size: [1540] bytes
> 
> Does this happen only on a particular network? If so, I guess you have a
> faulty SoHo router/firewall, which drops the second part of the
> fragmented UDP package of the INVITE message, so the Linux kernel on the
> SPCE is unable to re-assemble the package.
> 
> If it happens anywere, then you should check your network in front of
> your SPCE, maybe there is some kind of firewall or something.
> 
> I'm 100% sure it's a network issue, as it starts working if you remove
> some codes, making the overall packet smaller (<1400 bytes) and it
> doesn't get fragmented. I've seen this issue with dropped UDP fragments
> a lot of times already, both in residential routers (wifi routers of
> some sort) and in carrier grade firewalls.
> 
> Andreas

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