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 From:  "Aaron with Morad" <aaronc at morad dot ab dot ca>
 To:  "Raphael Maunier" <raphael at maunier dot net>, <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Vlan & Mtu problem
 Date:  Mon, 6 Jun 2005 07:54:07 -0600
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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>>>
>>
>