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TCP/IP problem on 2.2.18. Very big delay when pinging *local* interface (5x NIC, 18x IP).

DISCUSSION Rok Papez 2 participants 3 messages Apr 16, 2001 – Apr 18, 2001

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Rok Papez

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#0 lore raw

Hi!

Running 5x 3c905 NICs with 18 IPs

Summary:
When I boot Linux and ping a *local* IP address, it has a very big delay. Flood ping works without a glitch, normal ping exhibits a big delay at the start but will eventualy start working normally.

Has anyone noticed similar problems ?

[root@skuta network-scripts]# ping 172.26.4.254
PING 172.26.4.254 (172.26.4.254) from 172.26.4.254 : 56(84) bytes of data. 64 bytes from 172.26.4.254: icmp_seq=0 ttl=255 time=0.1 ms
64 bytes from 172.26.4.254: icmp_seq=1 ttl=255 time=19050.4 ms 64 bytes from 172.26.4.254: icmp_seq=2 ttl=255 time=24225.6 ms 64 bytes from 172.26.4.254: icmp_seq=3 ttl=255 time=28241.1 ms 64 bytes from 172.26.4.254: icmp_seq=4 ttl=255 time=32260.9 ms 64 bytes from 172.26.4.254: icmp_seq=5 ttl=255 time=36280.6 ms 64 bytes from 172.26.4.254: icmp_seq=6 ttl=255 time=35299.7 ms 64 bytes from 172.26.4.254: icmp_seq=7 ttl=255 time=34321.5 ms 64 bytes from 172.26.4.254: icmp_seq=8 ttl=255 time=33327.0 ms 64 bytes from 172.26.4.254: icmp_seq=9 ttl=255 time=32348.4 ms 64 bytes from 172.26.4.254: icmp_seq=10 ttl=255 time=31375.9 ms 64 bytes from 172.26.4.254: icmp_seq=11 ttl=255 time=30379.0 ms 64 bytes from 172.26.4.254: icmp_seq=12 ttl=255 time=29401.5 ms 64 bytes from 172.26.4.254: icmp_seq=13 ttl=255 time=28405.0 ms 64 bytes from 172.26.4.254: icmp_seq=14 ttl=255 time=27423.6 ms 64 bytes from 172.26.4.254: icmp_seq=15 ttl=255 time=26427.1 ms 64 bytes from 172.26.4.254: icmp_seq=16 ttl=255 time=25445.2 ms 64 bytes from 172.26.4.254: icmp_seq=17 ttl=255 time=24450.0 ms 64 bytes from 172.26.4.254: icmp_seq=18 ttl=255 time=23472.6 ms 64 bytes from 172.26.4.254: icmp_seq=19 ttl=255 time=22494.6 ms 64 bytes from 172.26.4.254: icmp_seq=20 ttl=255 time=21498.2 ms 64 bytes from 172.26.4.254: icmp_seq=21 ttl=255 time=20515.7 ms 64 bytes from 172.26.4.254: icmp_seq=22 ttl=255 time=19520.9 ms 64 bytes from 172.26.4.254: icmp_seq=23 ttl=255 time=18541.0 ms 64 bytes from 172.26.4.254: icmp_seq=24 ttl=255 time=17545.9 ms 64 bytes from 172.26.4.254: icmp_seq=25 ttl=255 time=16565.7 ms 64 bytes from 172.26.4.254: icmp_seq=26 ttl=255 time=15591.5 ms 64 bytes from 172.26.4.254: icmp_seq=27 ttl=255 time=14613.1 ms 64 bytes from 172.26.4.254: icmp_seq=28 ttl=255 time=13617.1 ms 64 bytes from 172.26.4.254: icmp_seq=29 ttl=255 time=12636.6 ms 64 bytes from 172.26.4.254: icmp_seq=30 ttl=255 time=11661.6 ms 64 bytes from 172.26.4.254: icmp_seq=31 ttl=255 time=10681.2 ms 64 bytes from 172.26.4.254: icmp_seq=32 ttl=255 time=9703.5 ms 64 bytes from 172.26.4.254: icmp_seq=33 ttl=255 time=8706.6 ms 64 bytes from 172.26.4.254: icmp_seq=34 ttl=255 time=7725.9 ms 64 bytes from 172.26.4.254: icmp_seq=35 ttl=255 time=6737.6 ms 64 bytes from 172.26.4.254: icmp_seq=36 ttl=255 time=5767.3 ms 64 bytes from 172.26.4.254: icmp_seq=37 ttl=255 time=4786.5 ms 64 bytes from 172.26.4.254: icmp_seq=38 ttl=255 time=3791.6 ms 64 bytes from 172.26.4.254: icmp_seq=39 ttl=255 time=2813.6 ms 64 bytes from 172.26.4.254: icmp_seq=40 ttl=255 time=1834.2 ms 64 bytes from 172.26.4.254: icmp_seq=41 ttl=255 time=837.8 ms 64 bytes from 172.26.4.254: icmp_seq=42 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=43 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=44 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=45 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=46 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=47 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=48 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=49 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=50 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=51 ttl=255 time=4000.7 ms 64 bytes from 172.26.4.254: icmp_seq=52 ttl=255 time=3021.2 ms 64 bytes from 172.26.4.254: icmp_seq=53 ttl=255 time=2025.4 ms 64 bytes from 172.26.4.254: icmp_seq=54 ttl=255 time=1048.1 ms 64 bytes from 172.26.4.254: icmp_seq=55 ttl=255 time=53.3 ms 64 bytes from 172.26.4.254: icmp_seq=56 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=57 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=58 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=59 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=60 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=61 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=62 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=63 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=64 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=65 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=66 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=67 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=68 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=69 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=70 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=71 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=72 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=73 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=74 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=75 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=76 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=77 ttl=255 time=0.1 ms
64 bytes from 172.26.4.254: icmp_seq=78 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=79 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=80 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=81 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=82 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=83 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=84 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=85 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=86 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=87 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=88 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=89 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=90 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=91 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=92 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=93 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=94 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=95 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=96 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=97 ttl=255 time=0.0 ms

--- 172.26.4.254 ping statistics ---
98 packets transmitted, 98 packets received, 0% packet loss round-trip min/avg/max = 0.0/8168.0/36280.6 ms

[root@skuta network-scripts]# ping 172.26.4.254
PING 172.26.4.254 (172.26.4.254) from 172.26.4.254 : 56(84) bytes of data. 64 bytes from 172.26.4.254: icmp_seq=0 ttl=255 time=0.1 ms
64 bytes from 172.26.4.254: icmp_seq=1 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=2 ttl=255 time=0.0 ms
64 bytes from 172.26.4.254: icmp_seq=3 ttl=255 time=0.0 ms

--- 172.26.4.254 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0.0/0.0/0.1 ms

BOX: Linux RedHat 6.2 with 2.2.18 kernel, custom compile.
--------------------------------------------------
eth0 Link encap:Ethernet HWaddr 00:01:02:F4:F3:BE

          inet addr:10.21.2.96  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:106287 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10118 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:5 Base address:0x1000

eth1 Link encap:Ethernet HWaddr 00:01:02:F4:F4:25
inet addr:172.26.1.254 Bcast:172.26.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1460 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100
Interrupt:11 Base address:0x1080

eth1:0 Link encap:Ethernet HWaddr 00:01:02:F4:F4:25

          inet addr:172.26.2.254  Bcast:172.26.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0x1080

eth1:1 Link encap:Ethernet HWaddr 00:01:02:F4:F4:25

          inet addr:172.26.3.254  Bcast:172.26.3.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0x1080

eth1:2 Link encap:Ethernet HWaddr 00:01:02:F4:F4:25

          inet addr:172.26.4.254  Bcast:172.26.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0x1080

eth1:3 Link encap:Ethernet HWaddr 00:01:02:F4:F4:25

          inet addr:172.26.5.254  Bcast:172.26.5.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0x1080

eth2 Link encap:Ethernet HWaddr 00:01:02:F4:F4:21
inet addr:172.26.100.1 Bcast:172.26.100.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100
Interrupt:5 Base address:0x1400

eth2:0 Link encap:Ethernet HWaddr 00:01:02:F4:F4:21

          inet addr:172.26.101.1  Bcast:172.26.101.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:5 Base address:0x1400

eth2:1 Link encap:Ethernet HWaddr 00:01:02:F4:F4:21

          inet addr:172.26.102.1  Bcast:172.26.102.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:5 Base address:0x1400

eth2:2 Link encap:Ethernet HWaddr 00:01:02:F4:F4:21

          inet addr:172.26.103.1  Bcast:172.26.103.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:5 Base address:0x1400

eth2:3 Link encap:Ethernet HWaddr 00:01:02:F4:F4:21

          inet addr:172.26.104.1  Bcast:172.26.104.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:5 Base address:0x1400

eth3 Link encap:Ethernet HWaddr 00:01:02:F4:F4:A6

          inet addr:172.26.200.1  Bcast:172.26.200.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:133068 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5112 errors:0 dropped:0 overruns:0 carrier:0
          collisions:154 txqueuelen:100
          Interrupt:10 Base address:0x1480

eth3:0 Link encap:Ethernet HWaddr 00:01:02:F4:F4:A6

          inet addr:172.26.201.1  Bcast:172.26.201.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:10 Base address:0x1480

eth3:1 Link encap:Ethernet HWaddr 00:01:02:F4:F4:A6

          inet addr:172.26.202.1  Bcast:172.26.202.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:10 Base address:0x1480

eth3:2 Link encap:Ethernet HWaddr 00:01:02:F4:F4:A6

          inet addr:172.26.203.1  Bcast:172.26.203.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:10 Base address:0x1480

eth3:3 Link encap:Ethernet HWaddr 00:01:02:F4:F4:A6

          inet addr:172.26.204.1  Bcast:172.26.204.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:10 Base address:0x1480

/* This one is totaly dummy... not connected */
eth4 Link encap:Ethernet HWaddr 00:01:02:F4:F4:89
inet addr:127.0.0.2 Bcast:127.255.255.255 Mask:255.0.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:55182 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100

lo Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:3924  Metric:1
          RX packets:2233847 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2233847 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0

------------------------------------------------------------
[root@skuta /root]# route -n
Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.26.1.254    0.0.0.0         255.255.255.255 UH    0      0        0 eth1
172.26.3.254    0.0.0.0         255.255.255.255 UH    0      0        0 eth1
172.26.101.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth2
172.26.103.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth2
172.26.5.254    0.0.0.0         255.255.255.255 UH    0      0        0 eth1
172.26.204.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth3
172.26.200.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth3
172.26.202.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth3
172.26.2.254    0.0.0.0         255.255.255.255 UH    0      0        0 eth1
172.26.100.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth2
172.26.102.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth2
172.26.4.254    0.0.0.0         255.255.255.255 UH    0      0        0 eth1
172.26.104.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth2
172.26.201.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth3
172.26.203.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth3
127.0.0.2       0.0.0.0         255.255.255.255 UH    0      0        0 eth4
10.21.2.96      0.0.0.0         255.255.255.255 UH    0      0        0 eth0
172.26.4.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
172.26.103.0    0.0.0.0         255.255.255.0   U     0      0        0 eth2
172.26.5.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
172.26.102.0    0.0.0.0         255.255.255.0   U     0      0        0 eth2
172.26.101.0    0.0.0.0         255.255.255.0   U     0      0        0 eth2
172.26.100.0    0.0.0.0         255.255.255.0   U     0      0        0 eth2
172.26.1.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
172.26.2.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
172.26.3.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
172.26.202.0    0.0.0.0         255.255.255.0   U     0      0        0 eth3
172.26.203.0    0.0.0.0         255.255.255.0   U     0      0        0 eth3
172.26.200.0    0.0.0.0         255.255.255.0   U     0      0        0 eth3
172.26.201.0    0.0.0.0         255.255.255.0   U     0      0        0 eth3
172.26.204.0    0.0.0.0         255.255.255.0   U     0      0        0 eth3
172.26.104.0    0.0.0.0         255.255.255.0   U     0      0        0 eth2
10.0.0.0        0.0.0.0         255.0.0.0       U     0      0        0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 eth4
0.0.0.0         10.1.1.1        0.0.0.0         UG    0      0        0 eth0

------------------------------------------------------
[root@skuta /etc]# lsmod
Module Size Used by

agpgart                 4724   1  (autoclean)
3c59x                  20928   5  (autoclean)
nistnet                49120   0  (unused)

[root@skuta /etc]# uname -a
Linux skuta 2.2.18 #2 Tue Mar 13 09:36:25 CET 2001 i686 unknown
------------------------------------------------------

Signature · 2 lines
lp,
Rok.
#1 lore raw
Quoted 9 lines · Rok Papez

Hi!

Running 5x 3c905 NICs with 18 IPs

Summary:
When I boot Linux and ping a *local* IP address, it has a very big delay. Flood ping works without a glitch, normal ping exhibits a big delay at the start but will eventualy start working normally.

try ping -n IP_ADDRESS. Chances are your reverse DNS is unhappy for the IP's in question.

--C

author
#2 lore raw
In reply to Rok Papez

Hi!

Quoted 7 lines · you
Quoted 4 lines

When I boot Linux and ping a *local* IP address, it has a very big delay. Flood ping works without a glitch, normal ping exhibits a big delay at the start but will eventualy start working normally.

try ping -n IP_ADDRESS. Chances are your reverse DNS is unhappy for the IP's in question.

Yes.. that was it. Thank you.
I was sure if I specified IP it wasn't doing any NS lookups.. Silly me. :-(.

Signature · 2 lines
lp,
Rok.