Stange things in Wget, yum

[antonio montagnani]

Please note the difference if I use flag --inet6 (that doesn't work) or
inet4 that works

get -v --inet6-only
http://download.fedora.redhat.com/pub/fedora/linux/core/4/i386/os/repodata/repomd.xml
--13:38:06--
http://download.fedora.redhat.com/pub/fedora/linux/core/4/i386/os/repodata/repomd.xml
           => `repomd.xml.6'
Risoluzione di download.fedora.redhat.com in corso... fallito: Name or
service not known.

 wget -v --inet4-only
http://download.fedora.redhat.com/pub/fedora/linux/core/4/i386/os/repodata/repomd.xml
--13:40:30--
http://download.fedora.redhat.com/pub/fedora/linux/core/4/i386/os/repodata/repomd.xml
           => `repomd.xml.6'
Risoluzione di download.fedora.redhat.com in corso... 66.187.224.20,
209.132.176.20, 209.132.176.220, ...
Connessione a download.fedora.redhat.com|66.187.224.20:80... connesso.
HTTP richiesta inviata, aspetto la risposta... 200 OK
Lunghezza: 1,140 (1.1K) [text/xml]

100%[====================================>] 1,140         --.--K/s

13:40:31 (673.08 KB/s) - "repomd.xml.6" salvato [1140/1140]


This happens on my router
therefore I can't also run yum update
yum update
Setting up Update Process
Setting up repositories
Cannot find a valid baseurl for repo: updates-released
Error: Cannot find a valid baseurl for repo: updates-released

Please note that similar commands work on other computer behind my router.
What shall I investigate???
--
Antonio Montagnani
Skype : antoniomontag
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