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 From:  Raphael Maunier <raphael at maunier dot net>
 To:  Aaron with Morad <aaronc at morad dot ab dot ca>, m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Vlan & Mtu problem
 Date:  Mon, 06 Jun 2005 17:31:39 +0200
So I will ask for a new feature :)
To be able to modify the mtu value on all physical interface. I mean on 
the GUI.
At the moment I have to use the exec.php to modify it.

--


Aaron with Morad wrote:

> That was it.
>
>
> Aaron
>
>
> ----- Original Message ----- From: "Raphael Maunier" 
> <raphael at maunier dot net>
> To: "Aaron with Morad" <aaronc at morad dot ab dot ca>; <m0n0wall at lists dot m0n0 dot ch>
> Sent: Monday, June 06, 2005 7:51 AM
> Subject: Re: [m0n0wall] Vlan & Mtu problem
>
>
>> Thanks Aaron,
>>
>> Where did you changed the mtu configuration on Monowall. The only MTU 
>> you can modify is on the Wan interface.
>>
>> -- 

>> Aaron with Morad wrote:
>>
>>> I had this same problem when I started using 802.1Q tagging.  It 
>>> appears that different NICs can packetize the data differently - 
>>> smaller packets, regardless of the MTU set.  After allowing for the 
>>> extra overhead of the 802.1Q tags, and a little more, I have been 
>>> using 1400 in the m0n0wall (no change in the PC's) for a few weeks 
>>> now and have not had any problems.
>>>
>>> Aaron
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Raphael Maunier" 
>>> <raphael at maunier dot net>
>>> To: <m0n0wall at lists dot m0n0 dot ch>
>>> Sent: Monday, June 06, 2005 4:07 AM
>>> Subject: [m0n0wall] Vlan & Mtu problem
>>>
>>>
>>>> Hi all,
>>>>
>>>> I have some pb with Vlan and Monowall.
>>>>
>>>> Here is my configuration:
>>>>
>>>> Monowall with 3 lan interfaces using 1.2b8
>>>> - Public
>>>> - Customers
>>>> - Backup server
>>>>
>>>> All interfaces are connected on a cisco switch.
>>>> All customers have to be on different subnet and don't have to see 
>>>> each other.
>>>> I use 802.1Q on customers interface.
>>>> Ip configuration is /27 for all Vlan interfaces
>>>> All Servers are Win2K3.
>>>>
>>>> Customers have to connect using PPTP (@home) and Ipsec (@work).
>>>>
>>>> Config ot the trunk
>>>>
>>>> sh run interface fastEthernet 0/47
>>>> Building configuration...
>>>>
>>>> Current configuration:
>>>> !
>>>> interface FastEthernet0/47
>>>>  description Customers 802.1Q Trunk
>>>>  switchport trunk encapsulation dot1q
>>>>  switchport mode trunk
>>>>  spanning-tree portfast
>>>> end
>>>>
>>>> sh int status | i Fa0/47
>>>> Fa0/47  Customers 802.1Q T connected    trunk    A-Full   A-100 
>>>> 100BaseTX/FX
>>>>
>>>>
>>>> For the test, all rules are "accept" between all interfaces. I have 
>>>> 2 W2K3 on 2 differents interfaces.
>>>> Both servers are able to ping each other. But when I try do use rdp 
>>>> from one interface to another, it doesn't work, even if I use 
>>>> "Allow fragmented packets". I also tried with PPTP.
>>>>
>>>> I finally sorted out using an MTU of 1468 on the win2K3 srv.
>>>> I thought that is was the end but into the Ipsec tunnel unable to 
>>>> use rdp.
>>>> I changed the MTU from 1468 to 1400 and it's seems to work this way.
>>>>
>>>> The problem seems to be located only on Giga Intel card. I tried 
>>>> with an Via ethernet card and no problem...
>>>>
>>>> FYI, I also test this configuration without vlan and only physical 
>>>> interface with default MTU value and all is ok.
>>>>
>>>> How can I be sure that the 1400 value for the Mtu will be the good 
>>>> one ?
>>>>
>>>> Thanks.
>>>>
>>>> -- 

>>>>
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>>>>
>>>
>>
>
>
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