sslug-teknik team mailing list archive

[Anna Jonna Armannsdottir <a@xxxxxxxxxxxx>]

On Sat, 2001-11-24 at 20:29, Jesper Honig Spring wrote:
> er der nogen som kan fortælle mig hvorledes jeg enabler broadcast på Loopback 
> adapteren? Ved /sbin/ifconfig står der p.t. 
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0

Ud fra masken kan du beregne hvad broadcasten er, 
nemlig 127.255.255.255 

Jeg prøvede lige at pinge til 127.0.0.1 og 0.2 og 
127.255.255.255 og de svarer alle sammen. 
Hvis jeg nu lukker af for broadcast, kommer der 
ingen svar når man pinger til 127.255.255.255 

# echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts 
brick:~# ping 127.255.255.255
PING 127.255.255.255 (127.255.255.255): 56 data bytes

--- 127.255.255.255 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
brick:~# ping 127.0.0.2
PING 127.0.0.2 (127.0.0.2): 56 data bytes
64 bytes from 127.0.0.2: icmp_seq=0 ttl=255 time=0.0 ms
64 bytes from 127.0.0.2: icmp_seq=1 ttl=255 time=0.0 ms
64 bytes from 127.0.0.2: icmp_seq=2 ttl=255 time=0.0 ms
64 bytes from 127.0.0.2: icmp_seq=3 ttl=255 time=0.0 ms

--- 127.0.0.2 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms
brick:~# ping 127.255.255.255
PING 127.255.255.255 (127.255.255.255): 56 data bytes

--- 127.255.255.255 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

Du er mistænkt for at være i gang med hemmelige 
eksperimenter med IPv6  ;-)) 

-- 
med venlig hilsen, Anna Jonna Armannsdottir       
                     ...ooO0Ooo...
It is one thing to protect the rights of copyright 
owners, but it is something else to make freedom 
illegal while doing so. There must be a better way.
Russell Pavlicek "The Open Source"
http://www.infoworld.com/articles/op/xml/01/10/15/011015opsource.xml

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