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Date:      Mon, 01 Mar 2004 14:56:26 -0300
From:      Juan Angel Menendez <juan@mecon.gov.ar>
To:        freebsd-net@freebsd.org
Subject:   Multipath patches for FreeBSD 4.8, working on a single interface
Message-ID:  <5.2.1.1.2.20040301142850.01edaf20@10.11.0.173>
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	Hi everyone

	I've just applied Tanzer's multipath routing patches over FreeBSD 4.8, 
compiled the kernel and everything worked fine.

	Basically, my idea is to load share default outgoing traffic over 2 
redundant routers which are on the same LAN.

	I've tried the following:

#test route add default -pathmetric 1 -gateway 10.10.16.2 -pathmetric 1 
-gateway 10.10.17.2
add net default

test# netstat 
-nr 
Routing tables

Internet:
Destination        Gateway            Flags/  Refs/      Use  Netif Expire 
metric  left
default                               UGSc      114      100    xl0
                    10.10.16.2            1               0      xl0
                   *10.10.17.2            1      0        0      xl0
127.0.0.1          127.0.0.1          UH         10  1000001    lo0
10.10.16/21      link#1             UC          8        0    xl0

test# route -n get default
    route to: default
destination: default
        mask: default
cur gateway: 10.10.17.2
  multipaths: 10.10.16.2  metric: 1
              10.10.17.2  metric: 1
   interface: xl0
       flags: <UP,GATEWAY,DONE,STATIC,PRCLONING>
  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu 
expire
        0         0         0         0         0         0      1500 
   0
sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>

test# ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         inet 10.10.16.11 netmask 0xfffff800 broadcast 10.10.23.255
         inet6 fe80::260:8ff:fecc:bc81%xl0 prefixlen 64 scopeid 0x1
         ether 00:60:08:cc:bc:81
         media: Ethernet autoselect (100baseTX <full-duplex>)
         status: active

	
	I've tried getting a file from the server using ftp, but the kernel always 
seems to choose the same path, it doesn't round robin over different paths. 
I checked that watching the routers interface's counters. I've also tried 
-pathmetric 10 and no -pathmetric at all without luck.

	Configuration examples showed how to make it to work using 2 different 
NICs, has anyone managed to make it to work using a single NIC ? Maybe 
using aliasing ?

	Any help will be appreciated.

Juan

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