Hello I've setup pptp server on cisco router today. The remote client IP addresses are assigned on this cisco router by DHCP. Also I set up option 249 and 121 to provide classless routing for my VPN clients. Option 249 and 121 used for two routes: 10.0.0.0/8 and 192.168.0.0/16. I've tested this configuration on my Windows XP and Mac OS X Snow Leopard. All working just fine. But my Windows 7 computer gets only the first address from the option 121 and ignores the next one. Why? How I can fix it or trace/debug it? Configuration of dhcp pool is: ip dhcp pool pptp-users network 10.255.241.0 255.255.255.0 default-router 10.255.241.1 dns-server 10.255.249.40 netbios-name-server 10.255.249.40 option 249 hex 080a.0aff.f101.10c0.a80a.fff1.01 option 121 hex 080a.0aff.f101.10c0.a80a.fff1.01

Hi, Based on my understanding, Windows 7 DHCP Client can accept Classless Static Routes in two options either in 121 or 249. If both the options are present in the packet, Option 121 will take precedence. Hope it helps. Alex ZhaoPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Alex, I know that. I'm just asking Why option 121 isn't working correctly on Windows 7?

Today I ran Microsoft Network Monitor on XP and 7. So I found that Windows XP sends DHCP INFORM message with full network hardware address (HardwareAddressLength==6). But Windows 7 sends DHCP INFORM message without network hardware address (HardwareAddressLength==0). Cisco doesn't like such request and Cisco doesn't send back DHCP ACK messages with proper options (Output from Cisco: DHCPD: illegal hardware address; dropping DHCP message).