Am 12.05.20 um 19:04 schrieb Erich Titl:
> Hi Boris
> 
> Am 12.05.2020 um 18:59 schrieb Boris:
>> Am 12.05.20 um 18:51 schrieb Erich Titl:
>>> Hi Boris
>>>
>>> Am 12.05.2020 um 18:46 schrieb Boris:
>>>> Am 12.05.20 um 18:32 schrieb Erich Titl:
>>>>> Hi Boris
>>>>>
>>>>> Am 12.05.2020 um 17:17 schrieb Boris:
>>>>>> Hej Erich and Sassy,
>>>>>> hej list,
>>>>>>
>>>>> ....
>>>>>
>>>>>>>
>>>>>>> Yes and one suggestion in FAQ77 suggests the same.
>>>>>>>
>>>>>>
>>>>>> Wow, what a success! Thank you so very much! That was the key!
>>>>>> I wrote the two sip-helpers in DONT_LOAD in shorewall.conf and the
>>>>>> phonecall work just perfect!
>>>>>
>>>>> Good
>>>>>
>>>>>>
>>>>>> Now the last issue is receiving the mail....
>>>>>> In this case pop3s is used and the traffic is redirected to a different
>>>>>> port as well. Is there another helper to be disabled??
>>>>>>
>>>>>
>>>>> Let us know more details about your pop3 problem.
>>>>>
>>>>
>>>> Hello Erich,
>>>>
>>>> well, the VoIP is a great success!
>>>>
>>>> BUT now as we make further checks, we find _some_ silly behaviour:
>>>>
>>>> 1. It's not possible to send mail via 1und1 but via t-online.
>>>> Thunderbird tells 'connected to smtp.1und1.de' but after a minute or so
>>>> there is a timeout. Same with receiving mail at pop.1und1.de.
>>>>
>>>> 2. It's not possible to visit at least one Website: wieistmeineip.de
>>>
>>> Have a look at you MTU size, you may need to twiddle that a little.
>>>
>>
>> MTU is set to 1492 .
>> I thought 1500 is default??
>>
> 
> ppp is different.
> 
> What is your entry in shorewall.conf
> 
> CLAMPMSS=Yes
> 

Current setting is

CLAMPMSS=No

I'll try to switch....

Boris


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