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If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml.
The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want.
Don't forget to restart Tomcat6 for the changes to take effect.

UPDATE, 20120521

See my comment below on how to disabe IPv6 on Ubuntu 11.10.

I have succesfully tested this on a Virtualbox-VM on my Mac.
The address for the connector port 8080 has been changed from 127.0.0.1 to 0.0.0.0 in server.xml.
Then disabling IPv6 makes the "tcp6" to go away, so it's binded to an IPv4-only address.

Before / with IPv6 enabled:

# netstat -anp | grep 8080 tcp6 0 0 :::8080 :::* LISTEN 1972/java

After / IPv6 disabled:

# netstat -anp | grep 8080 tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 2045/java

If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml. The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want. Don't forget to restart Tomcat6 for the changes to take effect.

UPDATE, 20120521

See my comment below on how to disable IPv6 on Ubuntu 11.10.

I have successfully tested this on a Virtualbox-VM on my Mac. The address for the connector port 8080 has been changed from 127.0.0.1 to 0.0.0.0 in server.xml.

Then disabling IPv6 makes the "tcp6" to go away, so it's binded to an IPv4-only address.

Before / with IPv6 enabled:

# netstat -anp | grep 8080   
tcp6       0      0 :::8080                 :::*                    LISTEN      1972/java

After / IPv6 disabled:

# netstat -anp | grep 8080   
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      2045/java

If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml.
The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want.
Don't forget to restart Tomcat6 for the changes to take effect.

UPDATE, 20120521

See my comment below on how to disabe IPv6 on Ubuntu 11.10.

I have succesfully tested this on a Virtualbox-VM on my Mac.
The address for the connector port 8080 has been changed from 127.0.0.1 to 192.168.0.1 in server.xml.
Then disabling IPv6 makes the "tcp6" to go away, so it's binded to an IPv4-only address.

Before / with IPv6 enabled:

# netstat -anp | grep 8080 tcp6 0 0 192.168.0.1:8080 :::* LISTEN 2353/java

After / IPv6 disabled:

# netstat -anp | grep 8080 tcp 0 0 192.168.0.1:8080 0.0.0.0:* LISTEN 2448/java

If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml.
The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want.
Don't forget to restart Tomcat6 for the changes to take effect.

UPDATE, 20120521

See my comment below on how to disabe IPv6 on Ubuntu 11.10.

I have succesfully tested this on a Virtualbox-VM on my Mac.
The address for the connector port 8080 has been changed from 127.0.0.1 to 0.0.0.0 in server.xml.
Then disabling IPv6 makes the "tcp6" to go away, so it's binded to an IPv4-only address.

Before / with IPv6 enabled:

# netstat -anp | grep 8080 tcp6 0 0 :::8080 :::* LISTEN 1972/java

After / IPv6 disabled:

# netstat -anp | grep 8080 tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 2045/java

If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml.
The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want.
Don't forget to restart Tomcat6 for the changes to take effect.

If you used this installer: "Apache Solr for TYPO3", you can change the address in the file server.xml.
The default points to localhost, so look for 127.0.0.1 and change it into the IPv4-address you want.
Don't forget to restart Tomcat6 for the changes to take effect.

UPDATE, 20120521

See my comment below on how to disabe IPv6 on Ubuntu 11.10.

I have succesfully tested this on a Virtualbox-VM on my Mac.
The address for the connector port 8080 has been changed from 127.0.0.1 to 192.168.0.1 in server.xml.
Then disabling IPv6 makes the "tcp6" to go away, so it's binded to an IPv4-only address.

Before / with IPv6 enabled:

# netstat -anp | grep 8080 tcp6 0 0 192.168.0.1:8080 :::* LISTEN 2353/java

After / IPv6 disabled:

# netstat -anp | grep 8080 tcp 0 0 192.168.0.1:8080 0.0.0.0:* LISTEN 2448/java