This is the scenario:
Inet Inet
| |
A(gw) B(gw)
\ /
\___ ___/
\/
Other nodes
|
|
C
A, B and the "other nodes" form an ad-hoc network and use the 10.x.x.x
private class.
A and B are nodes sharing their Inet connection.
The node C has to create an IPIP tunnel to one of the two gw to be sure that
all the packets routed to the Internet use the same gw.
The node C might decide to use both A and B to implement a simple load
sharing, in this way, the traffic load will be split between the two gateway:
- it creates an IPIP tunnel to A and B,
- adds in the routing table the default route using the tunnels which lead to
A and B as multipath gateways.
The question is: will an established connection use the same gw for all its
future packets?
If the answer is yes, then it's all fine, otherwise how is it possible to
implement it?
Keep in mind that since this is a setup done automatically by a routing
software, it isn't possible to depend on a unofficial patch, the users
wouldn't like it ;0
Note also that this is not the same setup of the "multiple internet
connection" HOWTOs, in fact, in that situation there is a single router which
NATs the connections.
The multipath code creates new cached routes. Since
after connect the socket is "connected", i.e. saddr and
daddr are known and they are always provided when resolving
route
So, the connected socket should not experience any outage
when the route is resolved after cache entry expiration
assuming the routing rules do not change.
(That is snip of the Julian Anastasov's reply in a lartc thread:
http://mailman.ds9a.nl/pipermail/lartc/2002q2/003780.html)
Does it mean that it should work?
Wouldn't be useful a multipath algorithm which selects nexthops considering the
devices' bandwidth usage (f.e. by monitoring /proc/net/dev)?
Thanks in advance
PS: for more information about the routing software see:
http://netsukuku.freaknet.org and http://lab.dyne.org/Ntk_IGS
--
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