binding on IPv6

[Stefan Winter]

Hi,

our production server binds to 

0.0.0.0:1812 according to netstat.

Now I wanted to add a FR 2.0 on a specific IPv6 address on the same port,
but that fails. I used to think these bindings should not conflict, and a
netcat session can easily do it.

Details:

- netcat before start:

/usr/local/freeradius/2.0.0-cvs/sbin # netstat -tunelup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 0.0.0.0:5666            0.0.0.0:*               LISTEN      0          209295     9124/xinetd
tcp        0      0 0.0.0.0:8525            0.0.0.0:*               LISTEN      0          267899     9931/tina_daemon
tcp        0      0 :::22                   :::*                    LISTEN      0          5711       2771/sshd
udp        0      0 0.0.0.0:1812            0.0.0.0:*                           1001       1254100    16368/radiusd
udp        0      0 0.0.0.0:1813            0.0.0.0:*                           1001       1254101    16368/radiusd
udp        0      0 0.0.0.0:8526            0.0.0.0:*                           0          267902     9931/tina_daemon
udp        0      0 127.0.0.1:123           0.0.0.0:*                           0          5741       2778/ntpd
udp        0      0 158.64.1.220:123        0.0.0.0:*                           0          5738       2778/ntpd
udp        0      0 0.0.0.0:123             0.0.0.0:*                           0          5732       2778/ntpd
udp        0      0 :::123                  :::*                                0          5733       2778/ntpd

Addresses are:

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:35:3C:32:E4
          inet addr:158.64.1.220  Bcast:158.64.1.223  Mask:255.255.255.224
          inet6 addr: 2001:a18:1:6::220/64 Scope:Global
          inet6 addr: fe80::216:35ff:fe3c:32e4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:73884754 errors:0 dropped:0 overruns:0 frame:0
          TX packets:113377902 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:23763202028 (22662.3 Mb)  TX bytes:50454772482 (48117.4 Mb)
          Interrupt:25

attempting to start with two listen directives on port 0, once for auth, once for acct:

radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipv6addr = 2001:a18:1:6::220 IPv6 address [2001:a18:1:6::220]
        port = 0
ERROR: Failed to open socket:
/usr/local/freeradius/config2//sites-enabled/default[38]: Error binding to port for 2001:a18:1:6::220 port 1812

(which should be fine, according to the binding list of netstat)

Using other ports works, here auth configured as 5000, acct as 5001:

radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipv6addr = 2001:a18:1:6::220 IPv6 address [2001:a18:1:6::220]
        port = 5000
}
listen {
        type = "acct"
        ipv6addr = 2001:a18:1:6::220 IPv6 address [2001:a18:1:6::220]
        port = 5001
}
Listening on authentication address 2001:a18:1:6::220 port 5000
Listening on accounting address 2001:a18:1:6::220 port 5001
Ready to process requests.


-- 
Stefan WINTER

Stiftung RESTENA - Réseau Téléinformatique de l'Education Nationale et de 
la Recherche
Ingenieur Forschung & Entwicklung

6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg
E-Mail: stefan.winter at restena.lu     Tel.:     +352 424409-1
http://www.restena.lu                Fax:      +352 422473
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