193 lines
6.6 KiB
Plaintext
193 lines
6.6 KiB
Plaintext
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# $Id:$
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# This advanced ppp configuration file explains how to implement
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# the following:
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#
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# ------------- ------------- -------------
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# | host1 | | host2 | | host3 |
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# ------------- ------------- -------------
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# | | |
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# |---------------------- LAN ----------------------|
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# |
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# -------------
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# | Gateway |
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# -------------
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# |
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# -----------------------------------
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# | | | |
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# isp1 isp2 isp3 ispN
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# | | | |
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# -----------------------------------
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# |
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# ------------
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# | Receiver |
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# ------------
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# |
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# Internet
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#
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# The connection is implemented so that any ISP connection can go down
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# without loss of connectivity between the LAN and the Internet. It is
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# of course also possible to shut down any link manually.
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#
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# There is a working example in ppp.*.span-isp.working that can be tested
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# on a single machine !
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#
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#
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# Prerequisites:
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#
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# o The Receiver machine must be in the outside world and must be willing
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# to accept a multilink ppp connection over UDP, assigning a routable IP
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# number to the Gateway machine. This probably means that it must be
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# a *BSD box as I know of no other ppp implementations that can use UDP
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# as a transport.
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#
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# o The Receiver machine must be multi-homed with at least N+1 addresses
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# where N is the maximun number of ISPs that you wish to use
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# simultaneously. We assume the IP numbers to be RIP1, RIP2 ... RIPN.
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# REAL-LOCAL-IP is the real IP number of the Receiver machine (and must
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# not be the same as any of the RIP* numbers).
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#
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# o Both the Gateway and the Receiver machines must have several tun
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# interfaces configured into the kernel (see below).
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#
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# o Both the Gateway and the Receiver machines must have the following
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# entry in /etc/services:
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#
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# ppp 6671/udp
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#
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# The port number isn't important, but it must be consistent across
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# machines.
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#
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# o The Receiver machine must have the following entry in
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# /etc/inetd.conf:
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#
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# ppp dgram udp wait root /usr/sbin/ppp ppp -direct vpn-in
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#
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# Note: Because inetd ``wait''s for ppp to finish, a single ppp
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# invocation receives all incoming packets. This creates
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# havoc with LQR magic number checks, so LQR *must not* be
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# enabled.
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# Also, -direct invocations of ppp do sendto()s using the
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# address that was last recvfrom()d. This means that the
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# returning traffic is a bit unbalanced. Perhaps ppp should
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# be smart enough to automatically clone an existing link
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# when it detects a new incoming address.... tricky !
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#
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# If you use ppp to connect to your ISPs, the isp* profiles shold be used,
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# resulting in the vpn* profiles being called from ppp.linkup.span-isp.
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# These invocations will bond together into a MP ppp invocation.
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#
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# If the link to your ISP is via another type of interface (cable modem
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# etc), simply configure the interface with a netmask of 0xffffffff and
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# add a route to RIPN via the interface address (no default). You can
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# then start ppp using the vpn-nic label.
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#
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# The Receiver machine should have N tun interfaces (where N is the maximum
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# number of ISPs that you wish to use simultaneously). The Gateway machine
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# requires N interfaces plus an additional N interfaces (total 2 * N) if
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# you're using ppp to talk to the ISPs.
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# Using ppp to connect to your ISPs (PPP over UDP over PPP):
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#
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# When we connect to our ISPs using ppp, we start the MP ppp invocation
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# from ppp.linkup (see ppp.linkup.span-isp) for each link. We also remove
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# the link from ppp.linkdown (see ppp.linkdown.span-isp). This is necessary
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# because relying on our LQR strategy (dropping the link after 5 missing
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# replies) is just too slow to be practical in this environment.
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#
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# This works because the MP invocations are smart enough to recognise that
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# another process is already running and to pass the link over to that
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# running version.
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#
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# Only the ISP links should be started manually. When they come up, they'll
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# start the MP invocation.
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default:
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set speed 115200
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set device /dev/cuaa0 /dev/cuaa1 /dev/cuaa2 /dev/cuaa3
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set dial "ABORT BUSY ABORT NO\\sCARRIER ABORT NO\\sDIAL\\sTONE TIMEOUT 4 \
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\"\" ATZ OK-ATZ-OK ATDT\\T TIMEOUT 60 CONNECT \\c \\n"
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set login
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set redial 3 5
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set timeout 0
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enable lqr
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set lqrperiod 15
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isp1:
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set phone "1234567"
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set authname isp1name
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set authkey isp1key
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add! RIP1/32 HISADDR
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isp2:
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set phone "2345678"
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set authname isp2name
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set authkey isp2key
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add! RIP2/32 HISADDR
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ispN:
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set phone "3456789"
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set authname ispNname
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set authkey ispNkey
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add! RIPN/32 HISADDR
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# Our MP version of ppp. vpn is a generic label used by each of the
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# other vpn invocations by envoking ppp with both labels (see
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# ppp.linkup.span-isp).
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# Each ``set device'' command tells ppp to use UDP packets destined for
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# the given IP/port as the link (transport). The routing table will
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# ensure that these UDP packets use the correct ISP connection.
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vpn:
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set enddisc LABEL
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set speed sync
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set mrru 1500
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alias enable yes
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set authname vpnname
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set authkey vpnkey
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add! default HISADDR
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disable deflate pred1 lqr
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deny deflate pred1
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vpn1:
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rename 1
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set device RIP1:ppp/udp
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vpn2:
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rename 2
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set device RIP2:ppp/udp
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vpnN:
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rename N
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set device RIPN:ppp/udp
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vpn-nic:
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load vpn
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clone 1 2 N
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link deflink rm
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link 1 set device RIP1:ppp/udp
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link 2 set device RIP2:ppp/udp
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link N set device RIPN:ppp/udp
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# The Receiver profile is a bit more straight forward, as it doesn't need
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# to get bogged down with sublinks. Replace REAL-ASSIGNED-IP with the
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# IP number to be assigned to the Gateway machine. Replace REAL-LOCAL-IP
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# with the real IP number of the Receiver machine.
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#
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# No other entries are required on the Receiver machine, and this entry
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# is not required on the Gateway machine. The Receiver machine also
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# requires the contents of ppp.secret.span-isp.
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#
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# Of course it's simple to assign an IP block to the client with a simple
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# ``add'' command, and then have the client use those IP numbers on its
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# LAN rather than using ``alias enable yes''.
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vpn-in:
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set enddisc label
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set speed sync
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set mrru 1500
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enable chap
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disable lqr
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set ifaddr REAL-LOCAL-IP REAL-ASSIGNED-IP
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