KVM Debian - Disabling ICMP Redirect Acceptance makes SSH and ping impossible -


i setting vpn lt2p/ipsec on debian kvm following tutorial : http://bailey.st/blog/2011/07/06/secure-ipsecl2tp-vpn-for-on-the-road-android-devices/

issuing command :

root@localhost:~# ipsec verify

i got following output

checking system see if ipsec got installed , started correctly: version check , ipsec on-path                             [ok] linux openswan u2.6.28/k2.6.32-5-686 (netkey) checking ipsec support in kernel                            [ok] netkey detected, testing disabled icmp send_redirects   [failed]    please disable /proc/sys/net/ipv4/conf/*/send_redirects   or netkey cause sending of bogus icmp redirects!  netkey detected, testing disabled icmp accept_redirects [failed]    please disable /proc/sys/net/ipv4/conf/*/accept_redirects   or netkey accept bogus icmp redirects!  checking pluto running                                  [ok] pluto listening ike on udp 500                              [failed]   cannot execute command "lsof -i udp:500": no such file or directory pluto listening nat-t on udp 4500                       [failed]   cannot execute command "lsof -i udp:4500": no such file or directory checking 'ip' command                                   [ok] checking 'iptables' command                             [ok] opportunistic encryption support                                [disabled]

so edited setting in /etc/sysctl.conf to

disable icmp redirect acceptance

net.ipv4.conf.all.accept_redirects = 0

i restarted networking in /etc/init.d

now problem comes : cannot connect through ssh kvm anymore nor ping ip. (the thing can use vnc)

how connect via ssh again without enabling icmp redirect acceptance?

i find soluton github gist: https://gist.github.com/kryptek/7683862


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