[LARTC] Strange problem
Dear All, My apologize if I post in the wrong place. I have a very strange problem with my Linux machine that be operated as Internet Gateway Below the simple picture of network configuration: INTERNET --| Linux |-- LAN / Mail server Linux machine only runs 2 services: SMTP & HTTP Proxy (webcache). Problem has started since yesterday of it's the SMTP traffics (TCP 25) to LAN (Eth1). But SMTP traffic to Internet (Eth0) are OK. All other traffic are OK, run well. I run telnet the port 25 of internal mail server (from Linux machine), the response is very slow but success (more than 1 minute). All of email client Outlook Express, Mac, etc (almost) always get timeout message when trying to send email through Linux machine. I run Ethereal to see the packets, seems there is no strange thing. I let users to relay to ISP's SMTP server (still NAT by Linux), traffic is fine. Email can pass through. Telnet-ing the port 25 of Linux machine give same response, very slow (but success). I have tried to pull out all of LAN cable and plug 1 PC directly to Linux Machine, result is same. I also replaced the Eth1 with another card, same result Hope you would share experiences to solve this abnormal problem. What other tools should I use to detect the problem source? Thank you so much for your kind help. Your advises are very appreciated. Thx & Rgds, Awie ___ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
[LARTC] Strange problem with HTB
Hi list, I've got quite a strange problem with htb. I have following configuration: dual core athlon, two intel e1000 nics - eth1 is connected to lan and has private ip, eth0 is connected to our isp and has public ip (so there's nat on eth0). There is practically same htb configuration on both interfaces, only the filters are different. On eth1, packets are classified by their destination address, howewer this does not work on eth0, because packets are already natted when they reach scheduling subsystem -- so their source ip is copied into fwmark by "IPMARK" iptables rule and classified according to this mark. Every ip has it's own htb class and for each ip something like this is run: tc class add dev eth0 parent 1:0011 classid 1:00ab htb rate 96kbit ceil 1000kbit prio 1 quantum 1500 tc qdisc add dev eth0 parent 1:00ab handle 00ab: esfq perturb 5 hash src tc class add dev eth1 parent 1:0011 classid 1:00ab htb rate 96kbit ceil 2000kbit prio 1 quantum 1500 tc qdisc add dev eth1 parent 1:00ab handle 00ab: esfq perturb 5 hash dst tc filter add dev eth0 protocol ip prio 5 parent 1:0 u32 ht 800:0: match mark 0x0a9ad002 0x flowid 1:00ab tc filter add dev eth1 protocol ip prio 5 parent 1:0 u32 ht 2:02: match ip dst 10.154.208.2 flowid 1:00ab Few days ago, I noticed that shaping on eth0 does not work. It probably happened at the same time I recompiled the kernel to support SMP, changed HZ from 250 to 1000 and changed packet scheduling subsystem clock source from CPU to gettimeofday() (because of smp). However, it doesn't neccessarily have to be the cause of the problem. Shaping on eth1 works ok, though the only difference is in the rate/ceil values and in the filters, and the filters work right -- packets reach correct class (byte/packet counters are incremented). Here is snippet of output from "tc -s class ls dev eth0". It seems strange to me that the "rate" value is actually higher than the ceil of the class -- can't it be kernel/tc bug or do I just misinterpreted the meaning of rate/ceil? class htb 1:ab parent 1:11 leaf ab: prio 1 rate 97000bit ceil 1000Kbit burst 1611b cburst 1725b Sent 184781922 bytes 122597 pkt (dropped 0, overlimits 0 requeues 0) rate 2465Kbit 203pps backlog 0b 7p requeues 0 lended: 96087 borrowed: 26507 giants: 0 tokens: -238223 ctokens: -19556 Does anyone have clue what can be wrong? Thanks in advance and sorry for my english, -MM ___ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
[LARTC] strange problem
hi all, I have strange problem into my network. traffic to one IP goes into exact same intervals and look like drop line and after 10sec and again start connection Traffic is into default HTB rules ( rate/ceil 8kbit) my question is can i prevent from these connect/disconnect values.and is there any docs for already detect problem like my. I use HTB P: 62.73.105.24 IN: 000360 kB Out: 021000 kB IN: 0.12 kB/sOut: 6.84 kB/s IP: 62.73.105.24 IN: 00 kB Out: 00 kB IN: 0.00 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 00 kB Out: 00 kB IN: 0.00 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 000400 kB Out: 021000 kB IN: 0.13 kB/sOut: 6.84 kB/s IP: 62.73.105.24 IN: 62 kB Out: 00 kB IN: 0.02 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 000124 kB Out: 00 kB IN: 0.04 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 000342 kB Out: 021000 kB IN: 0.11 kB/sOut: 6.84 kB/s IP: 62.73.105.24 IN: 62 kB Out: 00 kB IN: 0.02 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 00 kB Out: 018000 kB IN: 0.00 kB/sOut: 5.86 kB/s IP: 62.73.105.24 IN: 000360 kB Out: 003000 kB IN: 0.12 kB/sOut: 0.98 kB/s IP: 62.73.105.24 IN: 00 kB Out: 00 kB IN: 0.00 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 000360 kB Out: 021000 kB IN: 0.12 kB/sOut: 6.84 kB/s IP: 62.73.105.24 IN: 00 kB Out: 00 kB IN: 0.00 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 00 kB Out: 00 kB IN: 0.00 kB/sOut: 0.00 kB/s IP: 62.73.105.24 IN: 000332 kB Out: 019500 kB IN: 0.11 kB/sOut: 6.35 kB/ regards emil __ Do you Yahoo!? Yahoo! Mail is new and improved - Check it out! http://promotions.yahoo.com/new_mail ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
