Ping and Traceroute fail DNS fine

[rpaverd]

My issue is with a Windows Server 2003 environment via an ADSL router (no firewall, just NAT).

Web sites can be accessed, e-mail received, BUT, VOIP is breaking up. To try to analyse this I tried to traceroute to the VOIP server without any success - cannot traceroute to ANY server, only the first line with the LAN address of the router appears, thereafter, timeouts. Similarly cannot ping, address is correctly resolved, but no response.

Any suggestions?

Thanks

 

[chieftan999]

Is ICMP allowed on the router?

Both Traceroute and Ping use the Internet Control Messaging Protocol for communication. This can be disabled on routers.

 

[rpaverd]

Thanks for your response.

The router (Greatspeed) is provided by the ISP and integrated with the DSL modem. It has very basic settings for port forwarding, activating NAT and that is about it!

All of the parameters are shown in the status report as below (only username and password x'd out). I have had no problems with ping and traceroute with other similar router/modems at this location...

Richard

ADSL Status

Firmware version = R250S plus-R01C(0423)
DSPImageVersion = t79
Connected = true
Enable = true
AdslMode = multi
TxBitRate = 256
RxBitRate = 1024
TxCellRate = 618
RxCellRate = 2473
CurrentAttenuation = 17
CurrentSNRMargin = 42


Operating Mode :Routed PPP over ATM(RFC2364)

Ethernet IP: 192.168.1.50
LAN Subnetmask: 255.255.255.0
VPI: 0
VCI: 33
User Name= xxxxx
Password = xxxxx
Encapsulation: vcmux
Authentication=chap
NAT: enable
ADSL Mode: Multi Mode

Advanced Settings

DHCP Server: disable
Port Forwarding

Default workstation : disable

Service Port TCP/UDP IP Address
5631~5632 tcp 192.168.1.45
5631~5632 udp 192.168.1.45
80~80 tcp 192.168.1.23
443~444 tcp 192.168.1.23
1723~1723 tcp 192.168.1.23
3389~3389 tcp 192.168.1.23