Strange problem with ping on the gentoo?


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Faced with such a problem with ping-f ya.ru at:
02:37:47.456428 IP 127.0.0.1.37285 > 127.0.0.1.53: 13364+ PTR? 3.251.250.87.in-addr.arpa. (43)
02:37:47.456494 IP 127.0.0.1.53 > 127.0.0.1.37285: 13364 1/7/1 PTR www.yandex.ru. (262)
02:37:47.459406 IP 127.0.0.1.50299 > 127.0.0.1.53: 9445+ PTR? 3.251.250.87.in-addr.arpa. (43)
02:37:47.459473 IP 127.0.0.1.53 > 127.0.0.1.50299: 9445 1/7/1 PTR www.yandex.ru. (262)
02:37:47.459486 IP 127.0.0.1 > 127.0.0.1: ICMP 127.0.0.1 udp port 50299 unreachable, length 298
02:37:52.465455 IP 127.0.0.1.53 > 127.0.0.1.50299: 9445 1/7/1 PTR www.yandex.ru. (262)
02:37:52.465470 IP 127.0.0.1 > 127.0.0.1: ICMP 127.0.0.1 udp port 50299 unreachable, length 298
02:37:57.474243 IP 127.0.0.1.59784 > 127.0.0.1.53: 5279+ PTR? 3.251.250.87.in-addr.arpa. (43)
02:37:57.474385 IP 127.0.0.1.53 > 127.0.0.1.59784: 5279 PTR 1/7/1 www.yandex.ru. (262)
02:37:57.477619 IP 127.0.0.1.40930 > 127.0.0.1.53: 54444+ PTR? 3.251.250.87.in-addr.arpa. (43)
02:37:57.477721 IP 127.0.0.1.53 > 127.0.0.1.40930: 54444 1/7/1 PTR www.yandex.ru. (262)



I must say — I have localhost DNS-server, I do ping without the-n option (it's all OK, because no CSN), CSN-om all good, because he honestly says.

Axis gentoo dom0 (using xen virtualization), 2.6.34-xen-r4 x86_64, profile hardened/linux/amd64

Updated to the latest version of packages.

Precompiler in any case, another ping.

sysctl.conf is stock except for:
net.ipv4.ip_forward = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.force_igmp_version = 2
net.ipv4.conf.all.rp_filter=0



A little analysis of what is going on and what the odds are:
1) 02:37:47.459406 IP 127.0.0.1.50299 > 127.0.0.1.53: 9445+ PTR? 3.251.250.87.in-addr.arpa. (43)
2) 02:37:47.459473 IP 127.0.0.1.53 > 127.0.0.1.50299: 9445 1/7/1 PTR www.yandex.ru. (262)
3) 02:37:47.459486 IP 127.0.0.1 > 127.0.0.1: ICMP 127.0.0.1 udp port 50299 unreachable, length 298
4) 02:37:52.465455 IP 127.0.0.1.53 > 127.0.0.1.50299: 9445 1/7/1 PTR www.yandex.ru. (262)
5) 02:37:52.465470 IP 127.0.0.1 > 127.0.0.1: ICMP 127.0.0.1 udp port 50299 unreachable, length 298


1) was a request for resolv address 3.251.250.87.in-addr.arpa. port 50299/udp

2) DNS-server honestly replied — type www.yandex.ru

3) and then whoom. 50299/udp nobody listens and the answer is no one to take while ping continues to run and after a timeout continues to ping.

4) re-attempt to send a response (all two of them)

5) again, unreachble


I have a suspicion that we need to rebuild some system Libu — since a full rebuild was not done since installation (and it was a few years ago). But kagbe not want, for a long time.
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2 Answers

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Why do You start a flood ping (-f) poor on Yandex, and why while waiting for an answer to every icmp request?
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Here's how stoned harsh gentechnik even ping peremabiri. Always envied these people so much free time and such strong nerves.
Oh Yes, to help do not know than, sorry, just wanted to Express admiration.
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