Thread: (105) No buffer space available - related to arp table?

why ubuntu doing arp-request ip's not on local subnet of interface?

code:

bestpa@h4x0r:~$ sudo tcpdump  -vvv -n arp  tcpdump: listening on eth0, link-type en10mb (ethernet), capture size 65535 bytes  09:17:24.710888 arp, ethernet (len 6), ipv4 (len 4), request who-has 10.33.66.33 tell 10.10.145.13, length 28 09:17:24.711406 arp, ethernet (len 6), ipv4 (len 4), reply 10.33.66.33 is-at 00:00:0c:07:ac:63, length 46 09:17:24.934882 arp, ethernet (len 6), ipv4 (len 4), request who-has 10.33.66.32 tell 10.10.145.13, length 28 09:17:24.935332 arp, ethernet (len 6), ipv4 (len 4), reply 10.33.66.32 is-at 00:00:0c:07:ac:63, length 46 09:17:25.014872 arp, ethernet (len 6), ipv4 (len 4), request who-has 216.198.139.231 tell 10.10.145.13, length 28 09:17:25.015325 arp, ethernet (len 6), ipv4 (len 4), reply 216.198.139.231 is-at 00:00:0c:07:ac:63, length 46

the error i’ve been getting squid box lately ((105) no buffer space available) corresponds dmesg entry telling me neighbor table overflow.

code:

  bestpa@h4x0r:~$ dmesg   …   [371203.844141] ipv4: neighbour table overflow.   [371203.894697] ipv4: neighbour table overflow.   [371203.945323] ipv4: neighbour table overflow.   [371204.006787] ipv4: neighbour table overflow.   [371204.057160] ipv4: neighbour table overflow.   [371204.064572] ipv4: neighbour table overflow.   [371204.107918] ipv4: neighbour table overflow.

i message when machine appears clogged up. either squid proxy, or trying outbound ping on pre-exisitng ssh session.

code:

    bestpa@h4x0r:~$ ping 10.10.10.10   connect: no buffer space available

check out arp table… . pretty sure devices aren’t local subnet!

code:

bestpa@h4x0r:~$ ifconfig -a  eth0      link encap:ethernet  hwaddr 00:14:4f:9b:71:30             inet addr:10.10.145.13  bcast:10.10.145.255  mask:255.255.255.0           broadcast running multicast  mtu:1500  metric:1       bestpa@h4x0r:~$ arp -an    ? (207.171.7.177) @ 00:00:0c:07:ac:63 [ether] on eth0   ? (75.119.204.53) @ 00:00:0c:07:ac:63 [ether] on eth0   ? (209.85.145.104) @ 00:00:0c:07:ac:63 [ether] on eth0   ? (75.101.130.100) @ 00:00:0c:07:ac:63 [ether] on eth0   ? (216.137.41.219) @ 00:00:0c:07:ac:63 [ether] on eth0

watch arp table expand browse through squid proxy...

code:

bestpa@h4x0r:~$ while $1 > > arp -an | wc -l  > sleep 10 > done 63 91 127 137 149 167 186 196 210 225 235 ^c bestpa@h4x0r:~$    bestpa@h4x0r:~$ uname -a linux h4x0r 3.0.0-12-virtual #20-ubuntu smp fri oct 7 18:19:02 utc 2011 x86_64 x86_64 x86_64 gnu/linux bestpa@h4x0r:~$

i running 10.11 , have ipv6 disabled.

solved. problem after upgrade 11.04 11.10 , default route went missing! instead, interface ip used gateway. ubuntu, fix!

code:

bestpa@h4x0r:~$ netstat -nr  kernel ip routing table destination     gateway         genmask         flags   mss window  irtt iface 0.0.0.0         10.10.145.13    0.0.0.0         ug        0 0          0 eth0 10.10.145.0     0.0.0.0         255.255.255.0   u         0 0          0 eth0 169.254.0.0     0.0.0.0         255.255.0.0     u         0 0          0 eth0

used network utility specify default route again. have 1 entry in arp table, good.

code:

bestpa@h4x0r:~$ ping www.google.com ping www.l.google.com (72.14.204.147) 56(84) bytes of data. 64 bytes iad04s01-in-f147.1e100.net (72.14.204.147): icmp_req=1 ttl=50 time=37.4 ms 64 bytes iad04s01-in-f147.1e100.net (72.14.204.147): icmp_req=2 ttl=50 time=35.7 ms ^c --- www.l.google.com ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 35.777/36.609/37.442/0.854 ms bestpa@h4x0r:~$ arp -an  ? (10.10.145.1) @ 00:00:0c:07:ac:63 [ether] on eth0 bestpa@h4x0r:~$

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