[LARTC] split access 2 uplinks

[LARTC] split access 2 uplinks

[Alex]

I have setup split access with load balancing on a router that runs squid
but it appears that the second line it almost empty, the router send packets
trough the second line only from time to time, very rarely adn the mrtg
graphs only show something like 10-16kbit used on that line and instead the
primary line is full all the time. I have setup this only for squid, I don't
do any masqurading for the local net, just web acces via squid proxy server.
What's the remedy for this situation? Why does this happen? If that all I
can do then I have no use for such a setup , it doesn't help me at all.

Thanks,
Alex

Here the script that I use:  (192.168.55.1 is another router which actualy
has the second line conected physicaly and on that router I do SNAT for the
squid machine)

IF0="eth1"
IF1="eth2"
IF2="eth0"
IP0="192.168.254.125"
IP1="1.2.3.4"
IP2="192.168.55.2"
P1="1.2.3.1"
P2="192.168.55.1"
P0_NET="192.168.254.0/24"
P1_NET="1.2.3.0/26"
P2_NET="192.168.55.0/24"
#
ip route add 1.2.3.0/26 dev eth2 src 81.196.96.11 table T1
ip route add default via 1.2.3.1 table T1
ip route add 192.168.55.0/24 dev eth0 src 192.168.55.2 table T2
ip route add default via 192.168.55.1 table T2
#
ip route add 1.2.3.0/26 dev eth2 src 1.2.3.4
ip route add 192.168.55.0/24 dev eth0 src 192.168.55.2

ip rule add from 81.196.96.11 table T1
ip rule add from 192.168.55.2 table T2

##ip route add $P0_NET     dev $IF0 table T1
ip route add 192.168.55.0/24     dev eth0 table T1
##ip route add 127.0.0.0/8 dev lo   table T1
##ip route add $P0_NET     dev $IF0 table T2
ip route add 1.2.3.0/26     dev eth2 table T2
##ip route add 127.0.0.0/8 dev lo   table T2
#
ip route del default
ip route flush cache
ip route add default scope global nexthop via 1.2.3.1 dev eth2 weight 1
nexthop via 192.168.55.1 dev eth0 weight 1


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Re: [LARTC] split access 2 uplinks

[Steve Wright]

On Sat, 2003-08-30 at 00:13, Alex wrote:
> I have setup split access with load balancing on a router that runs squid
> but it appears that the second line it almost empty, the router send packets
> trough the second line only from time to time, very rarely adn the mrtg
> graphs only show something like 10-16kbit used on that line and instead the
> primary line is full all the time. I have setup this only for squid, I don't
> do any masqurading for the local net, just web acces via squid proxy server.
> What's the remedy for this situation? Why does this happen? If that all I
> can do then I have no use for such a setup , it doesn't help me at all.


The problem is the type of load-balancing you are using here.  Simply
add the word "equalize", viz ;

> ip route add default scope global nexthop via 1.2.3.1 dev eth2 weight 1
> nexthop via 192.168.55.1 dev eth0 weight 1


ip route add equalize default scope global \
	nexthop via 1.2.3.1 dev eth2 weight 1 \
	nexthop via 192.168.55.1 dev eth0 weight 1


Without the 'equalize` parameter, the links will be equalized on the
basis of connection spreading, not alternate packets.  Since you only
/have/ one outgoing connection(squid) there are no connections(plural)
to equalize!

'equalize' forces iproute2 to equalise at the /packet/ level, not the
connection level - more appropriate in your situation.

google for "policy routing book" for more on this. (see chapter 5)



DISCLAIMER:  I'm new at this.  Let the List Gurus comment before
converting your production system on my say.. 8-/

HTH,
Steve


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