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sysctl -w net.ipv4.conf.all.send_redirects behaviour
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truc
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Joined: 25 Jul 2005
Posts: 3199

PostPosted: Fri Apr 30, 2010 9:13 am    Post subject: sysctl -w net.ipv4.conf.all.send_redirects behaviour Reply with quote

Hello,

sysctl -w net.ipv4.conf.all.send_redirects=0 doesn't set every net.ipv4.conf.${INTERFACE}.send_redirects to 0.

This would be, I think, the expected behaviour since sudo sysctl -w net.ipv4.conf.all.forwarding=1 does set every net.ipv4.conf.${INTERFACE}.forwarding
sudo sysctl -a| grep send_redirect:
error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.lo.send_redirects = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.conf.eth1.send_redirects = 0
error: permission denied on key 'net.ipv6.route.flush'

sudo sysctl -w net.ipv4.conf.all.send_redirects=1:
net.ipv4.conf.all.send_redirects = 1

sudo sysctl -a| grep send_redirect:
error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.lo.send_redirects = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.conf.eth1.send_redirects = 0
error: permission denied on key 'net.ipv6.route.flush'






sudo sysctl -a| grep ipv4.*\\.forwarding:
error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.eth0.forwarding = 1
net.ipv4.conf.eth1.forwarding = 1
error: permission denied on key 'net.ipv6.route.flush'

sudo sysctl -w net.ipv4.conf.all.forwarding=0:
net.ipv4.conf.all.forwarding = 0

sudo sysctl -a| grep ipv4.*\\.forwarding:

error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.default.forwarding = 0
net.ipv4.conf.lo.forwarding = 0
net.ipv4.conf.eth0.forwarding = 0
net.ipv4.conf.eth1.forwarding = 0
error: permission denied on key 'net.ipv6.route.flush'




So my question is.. Is this a bug or not?
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Mike81
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Joined: 05 Jan 2011
Posts: 36

PostPosted: Wed Jan 09, 2013 11:55 pm    Post subject: Reply with quote

Hi,

I know the question is old, but did you find an answer? I see the same with "net.ipv4.conf.all.accept_redirects".

When you are googling for "accept_redirects" you will find many howtos/tutorials saying you should set

Code:
net.ipv4.conf.all.accept_redirects=0


in your /etc/sysctl.conf, but when you verify, even after a reboot,

Code:
# sysctl net.ipv4.conf.eth0.accept_redirects
net.ipv4.conf.eth0.accept_redirects = 1


So it seems like that nobody verify... :)

Setting it this via "net.ipv4.conf.default.accept_redirects" will do the trick. So when you reboot (or re-create eth0 without a reboot), everything will be as expected:

Code:
# sysctl net.ipv4.conf.eth0.accept_redirects
net.ipv4.conf.eth0.accept_redirects = 0


But it would be nice to know

  • Why does all sometimes work and sometimes not?
  • Is using default in sysctl.conf the recommended way? Seems to me...
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