Date: Wed, 15 May 2002 01:45:47 -0700 (PDT) From: Anshuman Kanwar <akanwar@engineering.ucsb.edu> To: <freebsd-net@freebsd.org> Subject: 4.4 route add default problem Message-ID: <Pine.LNX.4.33.0205150125370.12581-100000@ecipc056.engr.ucsb.edu>
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Summary:
--------
The -ifp option in route add default does not seem to have any effect, and
it is impossible to set a default route in certain conditions.
Is there a work around for route in 4.4 ?
Details
--------
I have 2 interfaces (fxp0 and 1) on my FreeBSD box. Initially only one of
the interfaces is UP. I am trying to write a high availability script that
automatically flops over to the 2nd interface, when the active interface
fails.
Here is (roughly) what I am doing:
# Bring failed interface down
ifconfig $old_intf down
# Clear ARP cache
arp -a -d
# Fail Over to Other Interface
ifconfig $new_intf inet xx.xx.xx.xxx netmask 255.255.255.224
broadcast xx.xx.xxx.xxx
# Delete old route
route delete default
# Bring new interface up
ifconfig $new_intf up
# Add new route
route add -ifp $new_intf default $DEF_ROUTE <<<<<< (1)
PROBLEM
-------
After the interface fails over, the default route (1 above) still points
out through the $old_intf. Here is a listing of netstat and ifconfig
before and after the switch:
before
--------
Destination Gateway Flags Refs Use Netif Expire
default 61.74.4.193 UGSc 4 487 fxp0
61.74.4.192/27 link#1 UC 1 0 fxp0
61.74.4.193 0:0:ac:7:ac:a4 UHLW 4 112 fxp0 955
127.0.0.1 127.0.0.1 UH 1 6 lo0
#ifconfig -a
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 61.74.4.212 netmask 0xffffffe0 broadcast 61.74.4.223
ether 00:02:b3:87:35:f2
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
fxp1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
inet 61.74.4.212 netmask 0xffffffe0 broadcast 61.74.4.223
ether 00:02:b3:87:35:f3
media: Ethernet autoselect (none)
after
-------
dell350-6# netstat -rn
Destination Gateway Flags Refs Use Netif Expire
default 64.74.4.193 UGSc 4 24 fxp0 <<<<<
61.74.4.192/27 link#2 UC 1 0 fxp1
61.74.4.193 0:0:c:7:ac:a4 UHLW 4 2 fxp1 1189
127.0.0.1 127.0.0.1 UH 1 6 lo0
# ifconfig -a
fxp0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
inet 61.74.4.212 netmask 0xffffffe0 broadcast 61.74.4.223
ether 00:02:b3:87:35:f2
media: Ethernet autoselect (none)
status: no carrier
fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 61.74.4.212 netmask 0xffffffe0 broadcast 61.74.4.223
ether 00:02:b3:87:35:f3
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
In the second listing notice that the default route STILL points to the
fxp0 interface which is down.
I googled the topic but not of much avail. Does anyone have any idea what
is happening and how to set the proper route?
My system is:
# uname -a
FreeBSD host.nyc 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Thu Apr 11 14:38:21
PDT 2002
Thanks for your time.
-ansh.
P.S. I am not on the list so please cc you reply.
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