
893-741-B
A7-13
Serial Line Internet Protocol (SLIP)
Routing Across a SLIP Link (Basic Passive RIP)
Both active and passive routing are available via the Routing Information Protocol (RIP) on the
Model 5390 server. The following sections deal with using only the most basic features of passive
RIP and are intended for administrators who need minimal routing features. For complete
information on both passive and active RIP, see Internet Protocol (IP) Routing, starting on page
A12-1.
The Model 5390 server bases its routing table on the information you specify in the gateway section
of the configuration file. As a passive gateway, the Model 5390 server then updates the table
according to information it receives from other routers but does not broadcast routing information
itself. This means that the Model 5390 server with a SLIP interface forwards packets addressed to
the host at the remote end of the connection, but does not inform other hosts, routers, or Model 5390
servers that it has this capability. Other hosts and routers on the same network must be told about
the route before they can use it.
To guarantee that a route in the gateway section of the config.annex file (or in the gateway entry
in /etc/gateways) uses a particular SLIP interface, the next hop in the route must match the remote
address of the SLIP link in the as a port’s SLIP route, the must match that port’s remote address.
For example, the following gateway entry uses the same interface as port 7 if port 7’s remote address
is
132.245.99.60
:
route add 132.245.99.0 255.255.255.0 132.245.99.60
Routing Between Two Networks
To make other hosts aware of a route over a SLIP link, use active routing in which a host running
routed advertises a route for the Model 5390 server. Create an entry in a host’s /etc/gateways file.
Using the example in Figure A7-2 on page A7-4, host03, whose Internet address is 132.254.10.9,
has the following /etc/gateways file entry:
host 132.254.5.9 gateway 132.254.10.7 metric 1 passive
This entry advertises a route for the host with the Internet address 132.254.5.9 through the Model
5390 server at 132.254.10.7. A host running gated can accomplish the same thing.
Having a host advertise a route results in an extra-hop situation. Hosts must direct their traffic
destined for host 132.254.5.9 to host 132.254.10.9, which then routes the traffic to the Model 5390
server at 132.254.10.7. To avoid this extra hop, the host at 132.254.10.9 needs to send out an ICMP
redirect message.
Содержание 5390
Страница 28: ...893 741 B Figures xxviii ...
Страница 44: ...893 741 B Preface xliv ...
Страница 45: ......
Страница 48: ......
Страница 60: ...A1 12 893 741 B Introduction to the Model 5390 Server ...
Страница 106: ...A3 18 893 741 B Configuring Ports ...
Страница 142: ...A5 12 893 741 B Printers ...
Страница 152: ...A6 10 893 741 B Modems ...
Страница 168: ...A7 16 893 741 B Serial Line Internet Protocol SLIP ...
Страница 224: ...A9 38 893 741 B Internetwork Packet Exchange IPX Protocol ...
Страница 258: ...A11 12 893 741 B Dial up Networking ...
Страница 289: ...893 741 B A12 31 Internet Protocol IP Routing that are possible ...
Страница 506: ...A15 86 893 741 B Using Model 5390 Security ...
Страница 507: ......
Страница 508: ... Chapter B1 Network Administration Chapter B2 Simple Network Management Protocol SNMP Part B Network Administration ...
Страница 544: ...B1 36 893 741 B Network Administration ...
Страница 574: ...B2 30 893 741 B Simple Network Management Protocol SNMP ...
Страница 575: ......
Страница 606: ...C1 30 893 741 B na Commands ...
Страница 676: ...C2 70 893 741 B Configuration Parameters ...
Страница 772: ...C3 96 893 741 B Using the CLI Commands ...
Страница 794: ...C5 12 893 741 B Network Protocols ...
Страница 795: ......
Страница 796: ... Appendix D1 Software Reference Part D Appendixes ...