On Wed, 2006-08-23 at 15:47 -0500, Chris Adams wrote: > Okay, I've got an odd one, and I'm hoping a kernel developer can at > least point me in the right direction. > > I've got a Linux box (Fedora Core 5 and kernel 2.6.17-1.2174_FC5), > sitting behind a Juniper J2300 router (running JUNOS 7.3R2.6), > attempting to FTP to an Alphaserver running Tru64 (5.1B or 4.0G). > > With that combination and a stateful firewall enabled on the Juniper, I > do not get the FTP banner when I open an FTP connection. The connection > just sits there. This is not the traditional FTP problems (active vs. > passive, reverse DNS lookup, authentication, etc.). > > If I downgrade my Linux box to the FC5 release kernel > (2.6.15-1.2054_FC5), it works fine. If I upgrade to the rawhide kernel > (2.6.17-1.2583.fc6), it does not work. > > Any other combination of OSes works (FTP from WinXP to Tru64, FTP from > Linux to Linux or Windows). An FC4 client with a (IIRC) 2.6.16 kernel > also works to Tru64. > > Now, this appears to be a Juniper JUNOS bug (and our Juniper SE is going > to open a case), but what could have changed between Linux kernels > 2.6.15 and 2.6.17 that would trigger it? I'm hoping to narrow this down > somehow to help Juniper find the problem. IIRC, 2.6.17 had some changes to TCP window scaling which breaks on some stupid NAT/firewall/load balancing appliances. (And some versions of BSD pf, apparently.) -- Nicholas Miell <nmiell@xxxxxxxxxxx> -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
