Packet loss with libpcap on a loopback interface
I'm trying to write a protocol decoder using libpcap. I'm having
problems with a simple test program that sends a simple "hello world"-
string on a TCP port. I intermittently receive some "TCP ACKed lost
segment" for the packets that are sent/received. My best guess is that
this is related to either libpcap or my setup since I get the same
behaviour using my own protocol decoder as with Wireshark. The fact
that the segments are not lost, other than for libpcap, are obvious
since the test application receives the data without any
retransmissions going ...Reapeatable packet loss on ulip interface over Solaris TCP on 100Mbps
I use VxSim with ulip over Solaris8.
Whenever the gap between 2 packets < 10usec -
The second received packet does not arrive to ulip interface.
This cause a very slow TCP connection.
On 10BaseT it never happens (probably because the inter packet gap > 10 usec).
Did anyone encountered this problem?
...packet loss because of big packets
The following problem occurs in my network:
The command 'ping anyhost' works well without packet loss. Ping sends
packets with a size of about 65 Bytes. If I grow the packet size with
the parameter -s, I have got packet loss. The command 'ping -s 65507
host' works well for some hosts, for others not (100 % loss).
Does this indicate bad network components? What does this mean for
other protocols like UDP or TCP?
Thank You for Your help!
This might be due to certain hosts not supporting ICMP Echo reply with
larger packet sizes.
htt...Packet loss on larger packets only
Being stumped on a problem with a Win2K (SP4) box.
Recently started to have network performance problems, no recent
configuration changes that I can identify that might be responsible.
I've narrowed the problem down to an issue where small packets are OK,
but I get lots of packet loss on packets larger than 200-250 bytes,
particularly over 300 bytes. This was tested by using "ping -t -l
<size> <destination>" for hosts either on the same LAN or over an
internet link. Problem manifests itself whether pinging from or to
the affected host.
This box also h...sending raw packet from specified interface in solaris
I have to network interfaces configured on same subnet. but I want to
send particular packet from specified interface. can you please tell me
any available mechanism..?
I tried with normal socket programming , SOCK_RAW but it is not working
any help is welcome..
> Hi All,
> I have to network interfaces configured on same subnet. but I want to
> send particular packet from specified interface. can you please tell me
> any available mechanism..?
> I tried with normal socket programming , SOCK_RAW but it is not working
>...New packet loss issue
I've submitted this as a Sun case, but I thought I'd post here as well
to see if anyone else has experienced this problem. Any ideas?
The server is an x4100 M2 running Solaris 10 11/06 x86. Patches were
current as of 4/9/2007, including a reconfig reboot at that time.
Yesterday, the server was rebooted and afterwards the packet loss was
noticed immediately. Note that as part of troubleshooting this
problem, I've brought the patches up to date as of yesterday,
performed a reconfig reboot, as well as performing a cold boot (with
power cables completely removed).
Is it possible to create many loopback interfaces (as in Cisco
routers) and get different statistics for these interfaces ?
Can anybody help me in the following subject?
Situation 1. Router 1 (2500 series) have 2 Serial Interface connected
to 2 Branches. Loopback Interface is also configured for the Router &
is running OSPF as the Routing Protocol. Does the Loopback Interface
have any role to play if both the Serial Interfaces goes down(Line
In article <email@example.com>,
Sabya <firstname.lastname@example.org> wrote:
:Can anybody help me in the following subject?
:Situation 1. Router 1 (2500 series) have 2 Serial Interface connected
:to 2 Branche...Packet loss?
As an exercise I am trying to implement a very simple packet-loss measurement
tool (copying the approach in Sting: a TCP-based Network Measurement Tool by
Stefan Savage). I am sending a padded HTTP GET request as a sequence of TCP
packets with 1 byte of payload to various web servers and watching the acks
coming back. I pause for 1 second between sending each TCP packet. I have two
1. I am not seeing any packet loss. Am I getting lucky or is the size of the
packet (1 byte payload) somehow not big enough to encourage packet loss?
2. Some web servers are happy ...Packet loss
Please, could anyone of you tell me why packet loss happens in a
computer network? Need to know when and why a packet is rejected and
disappears, and what takes that decision. I really need a deep
explanation or a source where I can dig in. Being quite new in this
subject, I have not found a clear explanation to this problem. Thanks
-----BEGIN PGP SIGNED MESSAGE-----
| Please, could anyone of you tell me why packet loss happens in a
| computer network?
Sunspot activity, backhoes, software bugs, firewalls, oxydation on
conn...interface to interface
Can I write a program to read packet from one interface and output
packet to another interface?
I wonder if os identify the two IP belong to interface in local
machine, transmitting the packet in IP layer,and no packet goes out
Is it possible to happen?
In article <email@example.com>,
firstname.lastname@example.org (Joseph) wrote:
> Can I write a program to read packet from one interface and output
> packet to another interface?
If you can write a program to read from one interface, and you can write
a program to write to the other interface, wh...Loopback Interface
I'm running a slave kerberos KDC on my OS X laptop. I need to access
the KDC when the laptop is disconnected from any network, but the KDC
doesn't bind to the loopback interface, and I can't seem to setup a
dummy interface in OS X. OS X shuts down any interface on which it
can't detect a link. How can I force the KDC to bind to the loopback
Kerberos mailing list Kerberos@mit.edu
>>>>> "ms419" == ms419 <ms419@...Question: C2 Security Configuration for general Unix and Solaris/Trusted Solaris (Auditing)
While reviewing the DoD 5200.28-STD "DEPARTMENT OF DEFENSE TRUSTED
COMPUTER SYSTEM EVALUATION CRITERIA" document and looking over
"Security Requirements for Automatic Data Processing (ADP)
Systems," for Federal systems requiring C2 compliance I realized
that I do not understand the distinction between Solaris and
On the issue of Accountability(auditing)
1. Can Unix machines using only the syslogd facility meet 'C2'
2. Does Trusted Solaris offer any system resource advantage
(CPU and Disk utilization) over Solaris usi...US-DE: Newark-Sr Unix Application Developer-Solaris,UNIX Internals,SQL,
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