09-30-2014
I'm afraid I'm not incredibly knowledgeable about either of them, but SLIP looks much simpler than turning your server into a mini one-point ISP... In effect it'd become another ethernet device once connected. You could have a mini private network, with the server on 10.0.0.1 perhaps, and you'd set your other end statically to 10.0.0.2 when you dial in.
That's why I'm concerned about reliability, it seems more complicated and has more points of failure than just dialing into a dumb terminal, as well as more technical things to remember and more possible mistakes. A plain serial terminal might still work when a bunch of daemons (including sshd) fail to start...
I wonder if there's any way to 'crash it' to a raw terminal if SLIP can't negotiate or just warn SLIP somehow with some serial flags or what-how.
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SL(4) BSD Kernel Interfaces Manual SL(4)
NAME
sl -- Serial Line IP (SLIP) network interface
SYNOPSIS
pseudo-device sl
DESCRIPTION
The sl interface allows asynchronous serial lines to be used as IPv4 network interfaces using the SLIP protocol.
To use the sl interface, the administrator must first create the interface and assign a tty line to it. The sl interface is created using
the ifconfig(8) create subcommand, and slattach(8) is used to assign a tty line to the interface. Once the interface is attached, network
source and destination addresses and other parameters are configured via ifconfig(8).
The sl interface can use Van Jacobson TCP header compression and ICMP filtering. The following flags to ifconfig(8) control these properties
of a SLIP link:
link0 Turn on Van Jacobson header compression.
-link0 Turn off header compression. (default)
link1 Don't pass through ICMP packets.
-link1 Do pass through ICMP packets. (default)
link2 If a packet with a compressed header is received, automatically enable compression of outgoing packets. (default)
-link2 Don't auto-enable compression.
DIAGNOSTICS
sl%d: af%d not supported . The interface was handed a message with addresses formatted in an unsuitable address family; the packet was
dropped.
SEE ALSO
inet(4), intro(4), ppp(4), strip(4), ifconfig(8), slattach(8), sliplogin(8), slstats(8)
J. Romkey, A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP, RFC, 1055, June 1988.
Van Jacobson, Compressing TCP/IP Headers for Low-Speed Serial Links, RFC, 1144, February 1990.
HISTORY
The sl device appeared in NetBSD 1.0.
BUGS
SLIP can only transmit IPv4 packets between preconfigured hosts on an asynchronous serial link. It has no provision for address negotiation,
carriage of additional protocols (e.g. XNS, AppleTalk, DECNET), and is not designed for synchronous serial links. This is why SLIP has been
superseded by the Point-to-Point Protocol (PPP), which does all of those things, and much more.
BSD
July 9, 2006 BSD