1) ethernet 1 --> priavte,默认开了rip(inbound)。
2) mtu value range from 68 到1500.
3) pppoe 有附加的8个字节，这种情况的mtu大于1500，要在vpnc上做更改。
4) 试探某处的mtu ping -f -l 1400 10.1.1.1
5)
vpn3k ----> configuration | interfaces
vpn3k ----> configuration | system |
system |server---> 3A,DNS,DHCP,NBNS,NTP.
system |address management----> address assignmnet option and address pools
system |ip routing---> static routes,default Gw,ospf,global DHCP and VRRP.
system |management protocol---> ftp,http,tftp,telnet,snmp,and xml.
system |event ---> defaults,classs,trap destinations syslog and smtp servers, and e-mail.
system |general---> system name,contact,location,time and date,maximum sessions,global
authen.
system |client update--->enable ,clients,urls,revisions.
system |load balancing---> cluster configuration,priority,enable,etc.
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