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.
> ----- 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
>> sh int status | i Fa0/47
>> Fa0/47 Customers 802.1Q T connected trunk A-Full A-100
>> 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
>> 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 ?
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