Operation Manual - Link Layer Protocol
H3C SecPath F1800-A Firewall
Chapter 2 PPP Configuration
4-18
Table 2-13
Configuring the dialing string needed for firewall callback
Action
Command
Configure the dialing string needed for firewall
callback.
ppp
callback ntstring
dial-string
Cancel the callback dialing string.
undo ppp callback ntstring
[
dial-string
]
2.2.10 Configuring DNS Address Negotiation
Do as follows in interface view.
Table 2-14
Configuring DNS address negotiation
Action
Command
Admit the request for DNS address
negotiation from the peer.
ppp ipcp dns admit-any
Configure the DNS address of local
negotiation.
ppp ipcp dns
primary-dns-address
[
secondary-dns-address
]
Remove the DNS address
configuration.
undo ppp ipcp dns
{
primary-dns-address
[
secondary-dns-address
] |
admit-any
}
By default, DNS address negotiation is denied.
Currently, only the firewall can serve as DNS address negotiation server.
2.2.11 Configuring
VJ TCP Header Compression
Van Jacobson TCP Header Compression (VJ TCP Header Compression), is a kind of
compression algorithm. It reduces the size of a TCP/IP header to about 3 bytes and
as a result improves the efficiency of slow speed line.
For description of VJ TCP header compression in detail, refer to RFC1144.
Do as follows in interface view.
Table 2-15
Configuring VJ TCP header compression
Action
Command
Enable VJ TCP header compression on a PPP interface.
ip tcp vjcompress
Disable VJ TCP header compression on a PPP
interface.
undo ip tcp
vjcompress
