HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 87
DNS spoofing, DNS proxy application
View all HP 6125XLG manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 87 highlights
Figure 31 DNS proxy application A DNS proxy operates as follows: 1. A DNS client considers the DNS proxy as the DNS server, and sends a DNS request to the DNS proxy. The destination address of the request is the IP address of the DNS proxy. 2. The DNS proxy searches the local static domain name resolution table and dynamic domain name resolution cache after receiving the request. If the requested information is found, the DNS proxy returns a DNS reply to the client. 3. If the requested information is not found, the DNS proxy sends the request to the designated DNS server for domain name resolution. 4. After receiving a reply from the DNS server, the DNS proxy records the IP address-to-domain name mapping and forwards the reply to the DNS client. If no DNS server is designated or no route is available to the designated DNS server, the DNS proxy does not forward DNS requests. DNS spoofing DNS spoofing is applied to the dial-up network, as shown in Figure 32. • The device connects to the PSTN/ISDN network through a dial-up interface and triggers the establishment of a dial-up connection only when packets are to be forwarded through the dial-up interface. • The device serves as a DNS proxy and is specified as a DNS server on the hosts. After the dial-up connection is established through the dial-up interface, the device dynamically obtains the DNS server address through DHCP or other autoconfiguration mechanisms. 78