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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:  Tue, 07 Jun 2005 10:59:29 +0200
Thanks,
I will test it.

--


edward mzj wrote:

>goto the diagnotisc-backup/restore and download the config.xml, then
>manually modify it and add the following to the <system> section
> <shellcmd>ifconfig vlanid-or-ifid mtu mtu-size</shellcmd>
>don't forget to upload the config.xml again
>On 6/7/05, Raphael Maunier <raphael at maunier dot net> wrote:
>  
>
>>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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>>>>>
>>>>>          
>>>>>
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>>>>
>>>>        
>>>>
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>>>
>>>      
>>>
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>>
>>    
>>
>
>  
>