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javeree
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Joined: 29 Jan 2006
Posts: 455
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 Posted: Wed Dec 05, 2012 8:15 pm Post subject: attempting to get an alternative ppp route [solved] |
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I set up an ethernet interface, which gets an (private 192.168.x.x) ip address from the dhcp server in my vdsl modem. This also sets up a defaultroute through this interface:
route
| Quote: | Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.1.1 0.0.0.0 UG 2 0 0 ethm
loopback localhost 255.0.0.0 UG 0 0 0 lo
192.168.1.0 * 255.255.255.0 U 0 0 0 ethm
192.168.4.0 * 255.255.255.0 U 0 0 0 br0
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As a next step, I set up a PPPoE connection directly with my ISP over this ethernet connection:
cat etc/conf.d/net.ppp1:
| Quote: | rc_need="net.ethm"
config_ppp1="ppp"
link_ppp1="ethm"
plugins_ppp1="pppoe"
pppd_ppp1="debug defaultroute usepeerdns lcp-echo-failure 8 lcp-echo-interval 15"
username_ppp1='my-vdsl-loginname'
metric_ppp1="2" |
This correctly sets up the ppp1 interface with a public address, but the route it sets up is to the isps ppp1 host only. there is no automatic creation of a default route with a metric "2"
route
| Quote: | Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.1.1 0.0.0.0 UG 2 0 0 ethm
1.53-242-81.ads * 255.255.255.255 UH 0 0 0 ppp1
loopback localhost 255.0.0.0 UG 0 0 0 lo
192.168.1.0 * 255.255.255.0 U 0 0 0 ethm
192.168.4.0 * 255.255.255.0 U 0 0 0 br0
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I can manually create it with
| Quote: | | ip route add default via 81.242.53.1 metric 1 |
end then it all works, but I would expect this to happen automatically.
I also tried creating a script in /etc/ppp/ip-up.d/90-defaultroute containing
| Quote: | | ip route add default via $5 metric 1 |
but it looks like that is also not called.
Any suggestion how to set this up ?
Last edited by javeree on Sun Dec 09, 2012 12:13 pm; edited 1 time in total |
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javeree
Guru
Joined: 29 Jan 2006
Posts: 455
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| Posted: Sun Dec 09, 2012 12:12 pm Post subject: |
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I found out that pppd does not create a default route if any default route already exists (even if there are differences like the metric).
That means it has to be done by hand.
I did this by creating a small script:
| Quote: | # /etc/ppp/ip-up.d/90-updateroute.sh
# This script is run by pppd after the link is established.
# it is called by cat /etc/ppp/ip-up
# with the following parameters:
# $1 = interface name (e.g. ppp0)
# $2 = tty device
# $3 = speed
# $4 = local IP address
# $5 = remote IP address
# $6 = ipparam (user specified parameter, see man pppd)
logger -t pppd $0: adding route for interface $1 on tty device $2 with speed $3: local IP=$4 : remote IP=$5 : ipparam=$6
METRIC=${$6#metric=}
[ -z "$METRIC" ] || METRIC="metric $METRIC"
ip route add default via $5 $METRIC
# end of /etc/ppp/ip-up.d/90-updateroute.sh |
/etc/conf.d/net.ppp1 contains
| Quote: |
# metric_pppx is gentoo syntax, but only used when a default route can be set up by pppd (so if this is the only defaultroute)
metric_ppp1="1"
# use ipparam to pass the metric to the scripts
pppd_ppp1="debug defaultroute usepeerdns lcp-echo-failure 8 lcp-echo-interval 15 ipparam metric=$metric_ppp1"
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