> traceroute to ntppool-varnish.develooper.com (2607:f238:2::51), 30 hops max, 
> 12 byte packets
>  1  Stone  2.197 ms  2.149 ms *
>  2  2610:98:8001:1::2  20.206 ms  20.056 ms  21.12 ms
>  3  2610:98:1::1  19.715 ms  23.343 ms  20.268 ms
>  4  2001:470:0:41::1  105.317 ms !N  107.428 ms !N  104.822 ms !N
> 
> It's not at all clear to me what's wrong here; superficially, looks
> like a routing snafu, but after three days I would ahve expected a
> routing hiccup to have fixed itself.  Is there anything I can do to
> help get it, whatever it is, fixed?

It appears that the address prefix is not announced anymore; I get
the same problem from different networks also. The route belongs to

NetRange:       2607:F238:: - 2607:F238:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
CIDR:           2607:F238::/32
OriginAS:       AS7012
NetName:        PHYBER-IPV6
NetHandle:      NET6-2607-F238-1
Parent:         NET6-2600-1
NetType:        Direct Allocation
NameServer:     RDNS02.PHYBER.COM
NameServer:     RDNS01.PHYBER.COM
RegDate:        2007-11-09
Updated:        2007-11-09
Ref:            http://whois.arin.net/rest/net/NET6-2607-F238-1

OrgName:        Phyber Communications, LLC.
OrgId:          PCL-90
Address:        214 Main Street #374
City:           El Segundo
StateProv:      CA
PostalCode:     90245
Country:        US
RegDate:        2007-05-22
Updated:        2008-11-04
Comment:        http://www.phyber.com
Comment:        +1-877-7-PHYBER (749237)
Ref:            http://whois.arin.net/rest/org/PCL-90

OrgTechHandle: NOC2563-ARIN
OrgTechName:   Network Operations Center
OrgTechPhone:  +1-877-774-9237
OrgTechEmail:  [email protected]
OrgTechRef:    http://whois.arin.net/rest/poc/NOC2563-ARIN

According to

http://www.ris.ripe.net/dashboard/2607:f238::/32

this is not reachable from anywhere, since Nov 4.
So I recommend to contact some operator there.

Regards,
Martin
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