I am currently comparing a Windows2000 RAS server to a Cisco dialup solution with a 3825 router, 8port BRI ISDN and 18 MICA Digital Modem card. Preformace testing with a ThinkPad T42 with builtin modem dialing up an ISDN number to the router. Testing was done with IPERF utility, here are the results:
Existing Windoes2000 Server RAS
Connection Speeds: TX=33.6Kbps / RX=?
Modem Settings: v.90/92 and v.44
Client Setup:
Server Type = ppp
Transports = TCP/IP
Authentication = MS-CHAP-v2
Compression = MPPC
PPP Multilink framing = on
iperf utility:
Client download = 2Mbps
Client upload = 1.7Mbps
New C3825 ISDN RAS
Connection Speeds: TX=50.6Kbps/RX=26.4Kbps
Modem Settings: v.90/92 and v.44
Client Setup:
Server Type = ppp
Transports = TCP/IP
Authentication = MS-CHAP-v2
Compression = MPPC
PPP Multilink framing = off
iperf utility:
With MPPC Enabled:
Client download = 760Kbps
Client upload = ? Kbps
No Comp Enabled:
Client download = 119Kbps
Client upload = 68Kbps
I'm not sure if there is a compression issues or what with the 3825. Is is possible that the 3825 is not keeping up with the MPPC compression and would require a AIM-COMPR4 module to help off-load this.
I've attached the router config as well just incase I've missed something.
