m0n0wall Forum - Allowing large ICMP packets

I'm having a problem with Monowall (1.2.x) dropping large ping packets. For instance:

Code:

Pinging 10.10.1.1 with 512 bytes of data:

Reply from 10.10.1.1: bytes=512 time=52ms TTL=63
Reply from 10.10.1.1: bytes=512 time=53ms TTL=63
Reply from 10.10.1.1: bytes=512 time=54ms TTL=63
Reply from 10.10.1.1: bytes=512 time=53ms TTL=63

Ping statistics for 10.10.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 52ms, Maximum = 54ms, Average = 53ms

C:\Documents and Settings\lab>ping -l 2048 10.10.1.1

Pinging 10.10.1.1 with 2048 bytes of data:

Request timed out.

I need this to avoid the issue mentioned here: http://www.experts-exchange.com/Networking/Q_21304901.html

Basically remote (connected over IPSec VPN) Windows machines are defaulting to "slow link" because m0n0wall is not replying to the 2k Ping. Any help would be very much appreciated,

Wes

EDIT: Seems I'm not alone: http://forum.m0n0.ch/index.php?topic=2760.0 . I've updated to 1.3b16 to see if that helped, nothing. Enabled fragmentation everywhere I could find it and still nothing.