hello
i am trying to set up ipsec in my network, for now just between two hosts, using to use AH & ESP
in tunnel mode to get all of packet encrypted. keys are negotiated with racoon.
mayby using tunnel mode in this case can seems strange, but i know what i am doing.
after setting up everything i have done few tests with ping & tcpdump. but the results are very suprising.
bellow is what i got when trying to ping (ping -I 192.168.2.11 192.168.1)
16:09:36.289743 IP 192.168.2.11 > 192.168.2.10: AH(spi=0x00db7ebd,seq=0x3): IP 192.168.2.11 > 192.168.2.10: ESP(spi=0x05ec9334,seq=0x3) (ipip-proto-4)
16:09:36.289968 IP 192.168.2.10 > 192.168.2.11: AH(spi=0x02c8c78c,seq=0x3): IP 192.168.2.10 > 192.168.2.11: ESP(spi=0x043cdc13,seq=0x3) (ipip-proto-4)
so far so nice...
16:09:36.289968 IP 192.168.2.10 > 192.168.2.11: ESP(spi=0x043cdc13,seq=0x3)
yet another ESP ?
16:09:36.289968 IP 192.168.2.10 > 192.168.2.11: icmp 64: echo reply seq 2
???? (you do not exist. go away.)
16:09:37.290596 IP 192.168.2.11 > 192.168.2.10: AH(spi=0x00db7ebd,seq=0x4): IP 192.168.2.11 > 192.168.2.10: ESP(spi=0x05ec9334,seq=0x4) (ipip-proto-4)
16:09:37.290935 IP 192.168.2.10 > 192.168.2.11: AH(spi=0x02c8c78c,seq=0x4): IP 192.168.2.10 > 192.168.2.11: ESP(spi=0x043cdc13,seq=0x4) (ipip-proto-4)
16:09:37.290935 IP 192.168.2.10 > 192.168.2.11: ESP(spi=0x043cdc13,seq=0x4)
16:09:37.290935 IP 192.168.2.10 > 192.168.2.11: icmp 64: echo reply seq 3
so as you can see 192.168.2.10 responds with three packets on each ping. why is it so ?
what should i od to get proper ipsec configuration here ? i can add that same results are with other protocols as well.
bellow is my configuration:
on host 192.168.2.10:
raccon.conf
path include "/usr/local/etc/racoon";
path pre_shared_key "/usr/local/etc/racoon/psk.txt";
path certificate "/usr/local/etc/racoon/certs";
listen {
isakmp 192.168.2.10;
strict_address;
}
remote 192.168.2.11 {
exchange_mode main;
doi ipsec_doi;
situation identity_only;
my_identifier asn1dn;
peers_identifier asn1dn;
verify_identifier on;
certificate_type x509 "mad.public" "mad.private";
peers_certfile x509 "laptop.public";
send_cert on;
send_cr on;
verify_cert on;
lifetime time 300 sec;
passive off;
proposal_check strict;
nonce_size 256;
proposal {
encryption_algorithm blowfish 448;
hash_algorithm sha1 512;
authentication_method rsasig;
dh_group modp4096;
lifetime time 300 sec;
}
}
sainfo anonymous {
pfs_group modp4096;
lifetime time 300 sec;
encryption_algorithm rijndael 256;
authentication_algorithm hmac_sha1;
compression_algorithm deflate;
}
padding {
randomize on;
randomize_length on;
strict_check on;
}
script for setting up policy:
#!/usr/bin/setkey -f
flush;
spdflush;
spdadd 192.168.2.10/32 192.168.2.11/32 any -P out ipsec
esp/tunnel/192.168.2.10-192.168.2.11/require
ah/tunnel/192.168.2.10-192.168.2.11/require;
spdadd 192.168.2.11/32 192.168.2.10/32 any -P in ipsec
esp/tunnel/192.168.2.11-192.168.2.10/require
ah/tunnel/192.168.2.11-192.168.2.10/require;
configuration for host 192.168.2.11:
path include "/usr/local/etc/racoon";
path pre_shared_key "/usr/local/etc/racoon/psk.txt";
path certificate "/usr/local/etc/racoon/certs";
listen {
isakmp 192.168.2.11;
strict_address;
}
remote 192.168.2.10 {
exchange_mode main;
doi ipsec_doi;
situation identity_only;
my_identifier asn1dn;
peers_identifier asn1dn;
verify_identifier on;
certificate_type x509 "laptop.public" "laptop.private";
peers_certfile x509 "mad.public";
send_cert on;
send_cr on;
verify_cert on;
lifetime time 300 sec;
passive off;
proposal_check strict;
nonce_size 256;
proposal {
encryption_algorithm blowfish 448;
hash_algorithm sha1 512;
authentication_method rsasig;
dh_group modp4096;
lifetime time 300 sec;
}
}
sainfo anonymous {
pfs_group modp4096;
lifetime time 300 sec;
encryption_algorithm rijndael 256;
authentication_algorithm hmac_sha1;
compression_algorithm deflate;
}
padding {
randomize on;
randomize_length on;
strict_check on;
}
script for setting up policy:
#!/usr/bin/setkey -f
flush;
spdflush;
spdadd 192.168.2.11/32 192.168.2.10/32 any -P out ipsec
esp/tunnel/192.168.2.11-192.168.2.10/require
ah/tunnel/192.168.2.11-192.168.2.10/require;
spdadd 192.168.2.10/32 192.168.2.11/32 any -P in ipsec
esp/tunnel/192.168.2.10-192.168.2.11/require
ah/tunnel/192.168.2.10-192.168.2.11/require;
what have i done wrong ?
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