Take the 2-minute tour ×  I got a CAW7740N Router behind a
Motorola SBV5121E Modem and from time to time the connection is
very slow. Every time I figured out that there are similar
entries in the routers security log:  08/12/2011  22:03:44 DHCP
Client: [WAN]Receive Ack from xx.xx.xx.xx,Lease time=3600
08/12/2011  22:03:44 DHCP Client: [WAN]Send Request, Request
IP=xx.xx.xx.xx  It usually occurs with web-application-like
websites like Facebook or Flickr and often if I load more than
one page very quickly simultaneously. I think that the slow down
doesn't occur if I turn off the routers firewall. Or could the
old Motorola Modem be a problem?  Here are the security
settings:  Stateful Packet Inspection:  SPI and Anti-DoS
firewall protection: on RIP defect: off Discard Ping To WAN
Interface: on  Stateful Packet Inspection:  Packet
Fragmentation: on TCP Connection: on UDP Session: on FTP
Service: on H.323 Service: on TFTP  Service: on  Connection
Policy: Fragmentation half-open wait: 10sec TCP SYN wait: 30sec
TCP