Date: Wed, 29 Jan 2003 22:35:18 +0300 (MSK) From: "Anton Kornev" <kant@valuehost.ru> To: FreeBSD-gnats-submit@FreeBSD.org Cc: kant@valuehost.ru Subject: kern/47648: creating alias on ethernet interface cause network to hang for 33 seconds Message-ID: <200301291935.h0TJZIsp001775@v20.valuehost.ru>
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>Number: 47648
>Category: kern
>Synopsis: creating alias on ethernet interface cause network to hang for 33 seconds
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 29 11:40:03 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Anton Kornev
>Release: FreeBSD 4.7-STABLE i386
>Organization:
ValueHost
>Environment:
System: FreeBSD v20.valuehost.ru 4.7-STABLE FreeBSD 4.7-STABLE #0: Tue Jan 28 19:24:52 MSK 2003 root@v20.valuehost.ru:/usr/src/sys/compile/V20 i386
Different i386 hosts. Sample configuration: SMP kernel, 2 * P-IV, 1GB mem,
SCSI disks, 2 em0 interfaces. Latest cvsupped stable.
>Description:
/sbin/ifconfig em0 alias [ip] netmask 255.255.255.255
hangs network for 30-35 seconds.
For example
su-2.05b# /sbin/ifconfig -a
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=3<rxcsum,txcsum>
inet 62.118.251.68 netmask 0xffffff00 broadcast 62.118.251.255
ether 00:07:e9:04:b0:08
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
em1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
options=3<rxcsum,txcsum>
ether 00:07:e9:04:b0:09
media: Ethernet autoselect
status: no carrier
sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552
faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
Now launch ping from any host and type
/sbin/ifconfig em0 alias 62.118.251.84 netmask 255.255.255.255
and host stopped to answer icmp echo-requests
kant@ahost:/usr/home/kant#ping 62.118.251.68
PING 62.118.251.68 (62.118.251.68): 56 data bytes
64 bytes from 62.118.251.68: icmp_seq=0 ttl=54 time=94.275 ms
64 bytes from 62.118.251.68: icmp_seq=1 ttl=54 time=80.934 ms
64 bytes from 62.118.251.68: icmp_seq=2 ttl=54 time=86.783 ms
64 bytes from 62.118.251.68: icmp_seq=3 ttl=54 time=88.531 ms
64 bytes from 62.118.251.68: icmp_seq=36 ttl=54 time=91.248 ms
64 bytes from 62.118.251.68: icmp_seq=37 ttl=54 time=111.068 ms
64 bytes from 62.118.251.68: icmp_seq=38 ttl=54 time=101.596 ms
64 bytes from 62.118.251.68: icmp_seq=39 ttl=54 time=80.684 ms
64 bytes from 62.118.251.68: icmp_seq=41 ttl=54 time=119.698 ms
tcpdump sessions saved on the target host (62.118.251.68)
also doesn't see any network activity this time.
>How-To-Repeat:
Obvious - see above.
>Fix:
unknown
>Release-Note:
>Audit-Trail:
>Unformatted:
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