Re: Policy routing work in 2.2 but not in 2.4

From: Casey Carter (Casey@Carter.net)
Date: Sat Jan 19 2002 - 20:45:58 EST


I can't tell you why source routing is not working properly, but I can
tell you that you don't need it. Just put the 1.1.1.1/0x02 route in the
main table, and your routing should work properly (at least, if there is
nothing bizarre in the main routing table).

Theodor Milkov wrote:

> Hello,
>
> I recently upgraded one of our routers with 2.4.17 Linux kernel and
> unfortunately my policy routing that used to work with 2.2.20 kernel
> failed. Quick test:
>
> # uname -r
> 2.2.20
>
> # ip rule ls
> 0: from all lookup local
> 32765: from all to 1.1.1.1 tos 0x02 lookup 199
> 32766: from all lookup main
> 32767: from all lookup 253
>
> # ip route ls table 199
> 1.1.1.1 via 10.0.0.2 dev eth1
>
> # ip route get to 1.1.1.1 tos 0x02
> 1.1.1.1 tos 0x02 via 10.0.0.2 dev eth1 src 10.0.0.1
> cache mtu 1500 rtt 375ms
>
> # ip route get to 1.1.1.1 tos 0x08
> 1.1.1.1 tos 0x08 via 192.168.0.1 dev eth0 src 192.168.0.2
> cache mtu 1500 rtt 375ms
>
> In this example everything seems ok - 192.168.0.1 is default gw. Lets
> see the next example:
>
> # uname -r
> 2.4.17
>
> # ip ru ls
> 0: from all lookup local
> 32765: from all to 1.1.1.1 tos 0x02 lookup 199
> 32766: from all lookup main
> 32767: from all lookup 253
>
> # ip route ls table 199
> 1.1.1.1 via 10.0.0.2 dev eth2
>
> # ip route get to 1.1.1.1 tos 0x02
> RTNETLINK answers: Network is unreachable
> # ip route get to 1.1.1.1 tos 0x08
> RTNETLINK answers: Network is unreachable
>
> So, in this example the 'ip rule' is ignored and thus lookup to table
> 199 never happens. Both kernels where compiled with
> 'CONFIG_IP_ROUTE_TOS=y'. iproute packages are iproute2-ss001007 for
> linux-2.2 kernel and iproute2-ss010824 for linux-2.4. What could be wrong?
>
> Best regards,
>

-- 
Casey Carter
Casey@Carter.net
ccarter@uiuc.edu
AIM: cartec69

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