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 From:  Raphael Maunier <raphael at maunier dot net>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Vlan & Mtu problem
 Date:  Mon, 06 Jun 2005 23:33:07 +0200
I've tried to download , modified the mtu value and upload the 
interfaces.inc files but on reboot, the value is back to 1500 ???
I changed the mtu value of the vlan interface "ifconfig vlan2 mtu 1400", 
and no more pb.
Is it possible to change the default MTU value of a vlan on Mono ?

Regards,



Raphael Maunier wrote:

> How can I setup the MTU to 1400 on specified interface on boot ?
> Will it work if I modify the MTU value to 1400 in file 
> etc/inc/interfaces.inc
>
> function interfaces_vlan_configure() {
> [...]
> if (in_array($drvname, $vlan_native_supp))
>                 $cmd .= " link0";
>             else if (in_array($drvname, $vlan_long_supp))
>                 $cmd .= " mtu 1500";
> [...]
>
> Thanks,

>
> Aaron with Morad wrote:
>
>> That would be a great feature.  It's nice to be able to see 
>> everything organized in the GUI.
>>
>> 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 9:31 AM
>> Subject: Re: [m0n0wall] Vlan & Mtu problem
>>
>>
>>> 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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>>>
>>>
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