Dear Listmates,

Could someone tell me how to change the MTU and how to disable "IP path
MTU discovery" on a NetBSD box?

I'm running mailing lists using postfix and majordomo on a Mac IIvx
running NetBSD 1.5. I have moved from CATV to ADSL recently, but since
then I started to receive undelivery reports (time out while sending the
data) for some but certain destination mail servers.

According to postfix FAQ, I now suspect this is due to dropped ICMP
message on the way causing timeouts. FAQ suggests to disable path MTU
discovery but I don't know how to do this. Is it enabled in the first place?

Our ADSL provider recommends MTU of 1454.

Any help would be appreciated.

Thank you,
rin

Rin Fukuda
Saitama, Japan