Date: Thu, 13 Mar 2008 02:16:25 -0400 From: Boris Kochergin <spawk@acm.poly.edu> To: freebsd-sparc64@freebsd.org Subject: TCPv4 broken without INET6 in kernel Message-ID: <47D8C6B9.4070908@acm.poly.edu>
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Hi, list. I have some Ultra 5s onto which I've installed 7.0-RELEASE. I then built custom kernels on them--without INET6 support. After booting with the new kernels, I noticed that networking seemed broken (the machines would not talk TCP to anything) and proceeded to investigate. With INET6 in the kernel, a telnet to port 22 of one of the Ultra 5s running sshd looks like this: # telnet 128.238.9.55 22 Trying 128.238.9.55... Connected to 128.238.9.55. Escape character is '^]'. SSH-2.0-OpenSSH_4.5p1 FreeBSD-20061110 Without INET6 in the kernel, it looks like this: # telnet 128.238.9.55 22 Trying 128.238.9.55... Connected to 128.238.9.55. Escape character is '^]'. Nothing happens after that. A packet capture of the latter attempt taken on the Ultra 5 is available at http://acm.poly.edu/~spawk/tcp-sparc64.pcap, and one taken on the other end is at http://acm.poly.edu/~spawk/tcp-i386.pcap. The kernel configuration and dmesg of the Ultra 5 I've dedicated to debugging this are up at http://acm.poly.edu/~spawk/TEST and http://acm.poly.edu/~spawk/dmesg, respectively, and I'm willing to provide access to the machine to any developers who may want to poke at it. Any help is appreciated. Thanks. -Boris
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