Europeonline questions

[Ralph Metzler <rjkm@netcologne.de>]

Nenad Opsenica writes:
 >     The second problem is that I can not tune TCP MSS value properly, in
 > fact I tried to increase MRU, MSS and window size on terrestrial (ISDN)
 > link, and the result was that MSS on DVB side increased from 480 (with
 > ISDN MRU/MTU of 576 bytes) to 1480 bytes (with any other
 > MRU/MTU/MSS/window size values on ISDN link). Similarily, TCP receiption
 > window size for DVB part is no grater than 65000 bytes, although I put
 > 128K in /proc/sys/net/core/rwin_default and 256K in rwin_max. It would
 > be very nice if window and MSS sizes on DVB could be set to larger
 > values.

DVB MPE is limited to 12 bits section length for the IP datagram (+
headers + CRC I think) anyway. OK, this should allow more than 1480 bytes.
What MSS does the proxy announce over DVB? Since the MSS cannot be
negotiated I guess it is those 1480 bytes.


Ralph