Release Notes:
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Version: Vigor3300 Series V2.5.8 Release
[New features]
1.VPN Load-balance and backup.
2.Data Monitoring for LAN. 
3.Auto Load Balance for China ISP. 
4.Add hidden CLI command "wan_count" to change total wan count to 3 WAN or 4 WAN.
5.Add mtu setup option for static WAN for Vigor3300 series.
6.Add DNS option in VPN-> pptp general setup page for vigor3300/V.
7.Play dial tone only when port registered.
8.Add call waiting option function.

[Fixed issues]
1.Modify flash driver for ST, upgarde old firmware not support ST flash on device 
  with ST flash will be rejected.
2."Port Scan detection" causes host-to-lan ipsec unstable.
3.Fix ipsec dpd issue between multi sa.
4.Write log file prior to record SIP syslog. 
7.Fixed call hold fail issue. 
8.User can not use VoIP calling while IP only is bound with LAN issue.
9.Fix static dhcp setting more than 67.
10.Move Static DHCP function to Bind IP to MAC.
11.IPSec DPD can't drop a dead connection.
12.Fix dhcp server assign ip issue when enable strict bind in bind ip to mac.
13.Add index to diagnostic tool both in web and CLI.
14.Display nat total session in web.
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