Lantronix SCS Reference Manual page 5

5.5.1 Inactivity Logouts..................................................................................................................... 5-10
5.5.2 Restricting Packets with Startup Filters................................................................................... 5-10
5.5.3 Reducing the Number of Ports Used.......................................................................................5-10
5.5.4 Using Higher Speed Modems .................................................................................................5-10
5.5.5 Restricting Connections to Particular Times............................................................................ 5-11
5.5.6 Increasing Requirements for Adding Additional Bandwidth.....................................................5-12
5.5.7 Controlling Frequency of Calls ................................................................................................ 5-12
5.6 Using the SCS Without Dialup Modems ................................................................... 5-13
5.6.1 Situations Where Dialup Modems Are Not Used.....................................................................5-13
5.6.2 Configuring the Unit for Modemless Connections ................................................................... 5-14
5.7 Character Mode Sites ............................................................................................... 5-15
5.8 Examples .................................................................................................................. 5-16
5.8.1 Creating a Chat Script .............................................................................................................5-16
5.8.2 Creating a Simple Firewall ...................................................................................................... 5-16
5.8.3 Controlling Access During Weekend Hours ............................................................................ 5-16
6: IP .............................................................................................................................. 6-1
6.1 IP Addresses............................................................................................................... 6-1
6.1.1 IP Addresses for Incoming Connections ...................................................................................6-2
6.1.2 IP Addresses For Outgoing Connections ..................................................................................6-4
6.2 Subnet Masks ............................................................................................................. 6-5
6.2.1 Length of Subnet Masks............................................................................................................6-6
6.3 Name Resolving.......................................................................................................... 6-6
6.3.1 Configuring the Domain Name Service (DNS) ..........................................................................6-7
6.3.2 Specifying a Default Domain Name ..........................................................................................6-7
6.3.3 Adding Hosts to the Host Table.................................................................................................6-7
6.4 Header Compression .................................................................................................. 6-8
6.5 Establishing Sessions ................................................................................................. 6-8
6.5.1 Telnet and Rlogin Sessions.......................................................................................................6-9
6.5.2 SSH Sessions ......................................................................................................................... 6-10
6.5.3 Restricting Connections to SSH ..............................................................................................6-17
6.5.4 Disabling HTTP and FTP ........................................................................................................ 6-17
6.6 IP Security................................................................................................................. 6-17
6.6.1 Configuring the Security Table ................................................................................................ 6-18
6.6.2 Clearing Table Entries.............................................................................................................6-18
6.7 IP Routing ................................................................................................................. 6-19
6.7.1 How Packets are Routed......................................................................................................... 6-19
6.7.2 Routing Tables ........................................................................................................................ 6-19
6.7.3 Using RIP ................................................................................................................................6-22
6.7.4 Proxy ARP ............................................................................................................................... 6-22
6.7.5 Using the NetBIOS Nameserver (NBNS) ................................................................................ 6-22
6.7.6 Routing and Subnetworks .......................................................................................................6-23
6.8 Displaying the IP Configuration................................................................................. 6-23
6.9 Examples .................................................................................................................. 6-25
6.9.1 IP Address Assignment for Remote Networking .....................................................................6-25
6.9.2 General IP Setup ....................................................................................................................6-26
6.9.3 Adding Static Routes............................................................................................................... 6-26
6.9.4 Default Routes to a Site ..........................................................................................................6-26
7: PPP........................................................................................................................... 7-1
7.1 LCP ............................................................................................................................. 7-1
7.1.1 Packet Sizes..............................................................................................................................7-1
7.1.2 Header Compression ................................................................................................................7-1
7.1.3 Character Escaping ...................................................................................................................7-1
7.1.4 PPP Authentication ...................................................................................................................7-2
7.1.5 CBCP ........................................................................................................................................7-3
iii