Re: major packet loss at hot server
Hi Sara, I wonder if you aren't better off just getting an ADSL line and switching service providers. - yba On Thu, 3 Apr 2008, sara fink wrote: Date: Thu, 3 Apr 2008 16:14:51 +0300 From: sara fink [EMAIL PROTECTED] To: Jonathan Ben Avraham [EMAIL PROTECTED] Cc: ILUG linux-il@cs.huji.ac.il Subject: Re: major packet loss at hot server I don't have a machine that runs tcpdump. Plus it needs root access. I wonder if I create one of these free shells that are out there, will it help? tcpdump will work without root as well? Last time I talked with 012 and hot, hot managed to dissconnect me completely. The support from hot was nice, but told me to unplug the cable and replug again. And from then I don't have internet at all. The /etc/resolv.conf is correct. I waited for hot to call me back, but it didn't happen. Since now I am not at home, I can't check anything. When I will return back will have to shout at them to connect me to internet. All the time when I ran mtr google.com (outside) there was the packet loss. The loss is in the 2nd and 3rd hop. first is the router of hot ( I have another router at home but last time I didn't use it for the purpose of checking and proving hot it's not my router fault), then the switch with 80% packet loss and 3rd another switch/router of hot with 20% packet loss. 2nd hop is bgp. port 179 open. 3rd switch/router has port 49 open (tacacs). AND from my scannings, I pass only through 1 switch which has bgp open. I have access to a machine, but not as root. I can run there traceroute. And will definitely run from there mtr to machine A and traceroute from there to my machine. Are there any others programs that I can run as simple user? I can't understand them, if I pass through such a switch, where they close all the ports and allow only 179, 646, and all udp ports are closed what kind of internet is that. It castrates all the concept of internet. BTW, I want to ask a legal question. I will finally submit a complaint through tluna.co.il, but I don't know if it's legal to submit the ip numbers. A lot of people are using these switches, and people don't know about this problem. Thanks in advance for all the help. Hi Sara, If you have access to a machine somewhere that runs tcpdump, then use hping commands from your MPLS to that machine in order to see if the packet loss is occuring on the outgoing or on the return trip. That is, hping out 50 packets. Check to see how many of those get to the target and then check to see how many of those that got to the target got back to you. If there is a more packet loss on the return leg than on the outgoing leg I would suspect a routing problem. If there is more loss on the early hops of the outgoing leg then I suspect either congestion or physical transmission problems with the final repeater or router. How do I use different routing? Any idea of which ips should I put? You can't if you dont have a static IP. Well, I guess that you could check the routing to your first hop out that has a routed IP address by using various foreign traceroute web pages. If the routing problem is low enough and there is only one BGP router through which your packets can pass, then you might not be able to see the routing problem. I was able to see the routing problem that I had at Netvision last week because I was able to access my line from different Netvision border routers because Netvision is pretty big. It was really clear that one particular border router was getting bad information from an internal router. I know someone who is very nice at 012. She belongs to service dep, and she promissed to send someone who knows well unix/linux. I will see what I can do today. Otherwise, www.tluna.co.il is the answer. I put last year a complaint there and they started to call me (not vice versa). The problem was solved. There is another weird thing which I don't understand: the ip 213.57.43.199 shows IP address: 213.57.43.199 Reverse DNS:[Timeout] Reverse DNS authenticity: [Unknown] ASN:8584 ASN Name: UNSPECIFIED (Barak AS) I don't belong to barak. Someone at 012 told me they have agreements and they use each router on the way. Most suppliers have agreements for routing between them instead or or as well as routing through the IIX. In addition many suppliers purchase overseas bandwidth from BBL or Barak/Netvision. You can probably ask Hot if they use Barak/Netvision. - yba http://www.dnsstuff.com/tools/ipall.ch?domain=213.57.43.199 If someone can explain this, I will be glad. On 3/29/08, Jonathan Ben Avraham [EMAIL PROTECTED] wrote: Hi Sara, Sounds like you should consider switching suppliers. Regarding my problem with Netvision reported last week, I was able to show Netvision the difference in results (5% loss vs 70% loss) when using different routes through Netvisions AS, mainly depending on where the
Re: major packet loss at hot server
OK - I decided to give this a look, because I'm not happy with my transfer speeds - I ran mtr from work (Netvision 5Mbit(?) ) to my home IP (Hot+Netvision): 4. vl100.coresw1.hfa.nv.net.il 23.0% 279 10.7 15.2 8.2 172.4 15.2 5. ge1-7.coresw1.ptk.nv.net.il 17.2% 279 10.8 16.1 10.6 98.1 12.1 6. clr1.cab01.ptk.nv.net.il 0.0% 279 12.8 18.9 10.5 109.8 16.4 7. ??? That vl100.coresw1.hfa.nv.net.il router is causing loss for every host I've tried. www.cnn.com (~15%). www.yahoo.com it's giving ~20% loss, and pos2-13.brdr1.lnd.nv.net.il is giving another 10%. www.google.com - vl100 is giving 16%, pos2-9.brdr1.lnd.nv.net.il is giving 26% loss. Is this on purpose, or is this some type of shaping/QOS? -mike On Sat, Mar 22, 2008 at 2:02 AM, Hetz Ben Hamo [EMAIL PROTECTED] wrote: I use ADSL (5Mbit). My ISP: Netvision. It seems that they also have some serious packet drops even from my machine to Netvision! check this out: (problems are marked with arrows) /mtr -c 10 -r netvision.net.il HOST: witch.dyndns.orgLoss% Snt Last Avg Best Wrst StDev 1. 192.168.1.1 0.0%101.3 0.9 0.7 1.4 0.3 2. lo0.lns05.hfa.nv.net.il 0.0%10 11.4 26.6 11.4 147.4 42.5 -- 3. vl201.coresw1.hfa.nv.net.il 30.0%10 30.6 16.3 12.0 30.6 6.4 --- 4. po41.srvc4.hfa.nv.net.il 0.0%10 30.5 16.6 11.7 30.5 7.4 5. ??? 100.0100.0 0.0 0.0 0.0 0.0 /mtr -c 10 -r www.ynet.co.il HOST: witch.dyndns.orgLoss% Snt Last Avg Best Wrst StDev 1. 192.168.1.1 0.0%100.8 0.9 0.7 1.4 0.2 2. lo0.lns05.hfa.nv.net.il 0.0%10 11.5 11.6 11.3 12.1 0.2 -- 3. vl201.coresw1.hfa.nv.net.il 40.0%10 12.1 14.6 11.8 27.1 6.1 -- 4. po41.srvc4.hfa.nv.net.il 0.0%10 11.6 12.9 11.6 17.9 2.1 5. 212.143.162.136 0.0%10 14.2 13.2 11.4 16.3 1.6 Hmm, I wonder if Netvision knows about this.. Hetz On Fri, Mar 21, 2008 at 10:10 PM, sara fink [EMAIL PROTECTED] wrote: Hello Everyone I am having major problem with packet loss at some hot server that sits in tel aviv. www.dnsstuff.com revealed this info. I would like to know how many people suffer from this problem. For this task mtr program is needed. The program can be downloaded at http://www.bitwizard.nl/mtr/ . The description of the program is mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool. As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME. by sending packets with purposly low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the response percentage and response times of the internet route to HOSTNAME. A sudden increase in packetloss or response time is often an indication of a bad (or simply overloaded) link. After installing this program please run the command mtr google.com or even mtr walla.co.il mtr ynet.co.il I got in all 3 urls ~75% packet loss at ip 213.57.43.199 and at 213.57.43.22 (or 14) another ~20% packet loss. Please inform me how many people suffer from this problem and who is their isp. Mine is 012. but the ips mentioned belong to hot. I already talked with a nice technician at hot and he promissed to give me an answer. Meanwhile at 012 tried to help me and in the end he told me it's a operating sytem problem. I just hate to hear such stupid excuses. I tried bot with and without iptables and it's the same. Instead of solving the problem they blame the OS. And all this happens with router or without. Besides that, the first IP is actually border gateway. Thanks for your help = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED] -- Skepticism is the lazy person's default position. my blog (hebrew): http://benhamo.org = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: major packet loss at hot server
Just talked to Netvision Asakim support - He was knowlegable - ran `mtr` on his workstation and saw the packet loss. He explained that there is no problem and that the core routers are dropping the ping packets based on the amount of load on the router. He explained that the router should only be dropping ICMP packets. I got to them by calling support ( 04-856-0550 ?) and telling them that there is a problem with their core network. On Fri, Apr 4, 2008 at 2:12 PM, Michael Tewner [EMAIL PROTECTED] wrote: OK - I decided to give this a look, because I'm not happy with my transfer speeds - I ran mtr from work (Netvision 5Mbit(?) ) to my home IP (Hot+Netvision): 4. vl100.coresw1.hfa.nv.net.il 23.0% 279 10.7 15.2 8.2 172.4 15.2 5. ge1-7.coresw1.ptk.nv.net.il 17.2% 279 10.8 16.1 10.6 98.1 12.1 6. clr1.cab01.ptk.nv.net.il 0.0% 279 12.8 18.9 10.5 109.8 16.4 7. ??? That vl100.coresw1.hfa.nv.net.il router is causing loss for every host I've tried. www.cnn.com (~15%). www.yahoo.com it's giving ~20% loss, and pos2-13.brdr1.lnd.nv.net.il is giving another 10%. www.google.com - vl100 is giving 16%, pos2-9.brdr1.lnd.nv.net.il is giving 26% loss. Is this on purpose, or is this some type of shaping/QOS? -mike On Sat, Mar 22, 2008 at 2:02 AM, Hetz Ben Hamo [EMAIL PROTECTED] wrote: I use ADSL (5Mbit). My ISP: Netvision. It seems that they also have some serious packet drops even from my machine to Netvision! check this out: (problems are marked with arrows) /mtr -c 10 -r netvision.net.il HOST: witch.dyndns.orgLoss% Snt Last Avg Best Wrst StDev 1. 192.168.1.1 0.0%101.3 0.9 0.7 1.4 0.3 2. lo0.lns05.hfa.nv.net.il 0.0%10 11.4 26.6 11.4 147.4 42.5 -- 3. vl201.coresw1.hfa.nv.net.il 30.0%10 30.6 16.3 12.0 30.6 6.4 --- 4. po41.srvc4.hfa.nv.net.il 0.0%10 30.5 16.6 11.7 30.5 7.4 5. ??? 100.0100.0 0.0 0.0 0.0 0.0 /mtr -c 10 -r www.ynet.co.il HOST: witch.dyndns.orgLoss% Snt Last Avg Best Wrst StDev 1. 192.168.1.1 0.0%100.8 0.9 0.7 1.4 0.2 2. lo0.lns05.hfa.nv.net.il 0.0%10 11.5 11.6 11.3 12.1 0.2 -- 3. vl201.coresw1.hfa.nv.net.il 40.0%10 12.1 14.6 11.8 27.1 6.1 -- 4. po41.srvc4.hfa.nv.net.il 0.0%10 11.6 12.9 11.6 17.9 2.1 5. 212.143.162.136 0.0%10 14.2 13.2 11.4 16.3 1.6 Hmm, I wonder if Netvision knows about this.. Hetz On Fri, Mar 21, 2008 at 10:10 PM, sara fink [EMAIL PROTECTED] wrote: Hello Everyone I am having major problem with packet loss at some hot server that sits in tel aviv. www.dnsstuff.com revealed this info. I would like to know how many people suffer from this problem. For this task mtr program is needed. The program can be downloaded at http://www.bitwizard.nl/mtr/ . The description of the program is mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool. As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME. by sending packets with purposly low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the response percentage and response times of the internet route to HOSTNAME. A sudden increase in packetloss or response time is often an indication of a bad (or simply overloaded) link. After installing this program please run the command mtr google.com or even mtr walla.co.il mtr ynet.co.il I got in all 3 urls ~75% packet loss at ip 213.57.43.199 and at 213.57.43.22 (or 14) another ~20% packet loss. Please inform me how many people suffer from this problem and who is their isp. Mine is 012. but the ips mentioned belong to hot. I already talked with a nice technician at hot and he promissed to give me an answer. Meanwhile at 012 tried to help me and in the end he told me it's a operating sytem problem. I just hate to hear such stupid excuses. I tried bot with and without iptables and it's the same. Instead of solving the problem they blame the OS. And all this happens with router or without. Besides that, the first IP is actually border gateway. Thanks for your help = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe |
[HAIFUX Lecture] IPv6 in the Linux Kernel (Advanced Linux Kernel Networking) by Rami Rosen
Next Monday, 7th of April, at 18:30 the Haifa Linux Club, will gather to enjoy Rami Ronen's presenation about IPv6 in the Linux Kernel (Advanced Linux Kernel Networking) Abstract This lecture is a sequel to the Linux Kernel Networking lecture and Advanced Linux Kernel Networking - Neighboring Subsystem; IPSec. This lecture will mostly deal with IPV6 implementation in the linux kernel. We will also discuss some IPV6 user space tools, and also draw a comparison between IPV6 and IPV4. Among the topics we will deal with are: * IPV6 * General background and history * ICMPV6 * Router Advertisements and Router Solicitations o Radvd daemon * Autoconfiguration o DHCPV6 o MLDv1 and MLDv2 o IPV6 header o SOKCET API Note: If time permits, we will also talk shortly about Network Namespaces and Bridging Subsystem. == We meet in Taub building, room 6. For instructions see: http://www.haifux.org/where.html Attendance is free, and you are all invited! == Future Lectures: None. You see, our queue is empty. Now I don't want to sound like the Polish mother who can sit in the dark while you go outside in a cold night without sweater and not calling her once you arrive (Sheko'o Ye'hie li Tov), so I won't say a word. I will just sit here quite, and look at the mailbox, hoping that someone, maybe YOU, will send an email to [EMAIL PROTECTED] proposing an interesting presentation. I mean, I already have my diploma, and the bell is for me and for you. And of course, Don't drink marijuana there, you hear me?!?. We are always interested in hearing your talks and ideas. If you wish to give a talk, hold a discussion, or just plan some event haifux might be interested in, please contact us at [EMAIL PROTECTED] -- Orr Dunkelman, [EMAIL PROTECTED] Any human thing supposed to be complete, must for that reason infallibly be faulty -- Herman Melville, Moby Dick. GPG fingerprint: C2D5 C6D6 9A24 9A95 C5B3 2023 6CAB 4A7C B73F D0AA (This key will never sign Emails, only other PGP keys. The key corresponds to [EMAIL PROTECTED]) = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: major packet loss at hot server
On Fri, Apr 4, 2008 at 10:35 PM, Michael Tewner [EMAIL PROTECTED] wrote: Just talked to Netvision Asakim support - He was knowlegable - ran `mtr` on his workstation and saw the packet loss. He explained that there is no problem and that the core routers are dropping the ping packets based on the amount of load on the router. He explained that the router should only be dropping ICMP packets. I didn't read all the messages on this thread but maybe if you could run the same tests with tcptraceroute you could see weather the packet drop happens to TCP packets or not? --Amos
