Hi,

We have configured 
 MTU 1504 on en0 and 
 MTU 1500 on en1 
But we have observed that during Ftp negotiations 1464 is advertised.
Incase MTU 1500 is configured both on en0 and en1, 1460 is advertised.


[Packet summary from wireshark]
13	14:35:28.886466	172.18.4.118	172.18.4.244	TCP	cisco-ipsla > ftp [SYN] Seq=0 Win=65535 Len=0 MSS=1460
14	14:35:28.887697	172.18.4.244	172.18.4.118	TCP	ftp > cisco-ipsla [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1464
where 172.18.4.244 is the IP for the site running on QNX

Pls. let us know what is the probable cause.

regards,