weblog d’un abbe

20061208

Airtel Broadband dropping all outgoing packets to SMTP port

Filed under: Experiences — abbe @ 0011

Well, this I just experienced a few minutes ago, and I think I should blog it. After queuing a mail on 127.0.0.1 smtp server in evening, I found that it was still not delivered. On tailing /var/log/maillog I found that smtp port of smtp.gmail.com is unreachable. I tried to telnet smtp.gmail.com on smtps port, there I got connected. So, I thought Gmail might have dropped support for relaying mails via smtp port, only smtps port. So then I asked one of my friend Edwin, who is fortunately online from non-Indian (or to be more precise, non-Airtel) network, to connect to smtp port of smtp.gmail.com. He told me that he is able to connect. Now, the next thought that came in my mind, Gmail has blocked smtp port of a specific box (though chances of that is very low, as these companies are running cluster of servers for load balancing, and anyways I never worked on clustered network :( ). So I tried another IPv4 address of smtp.gmail.com, still same problem. Then I thought to try connecting to another SMTP server’s smtp, so this time I tried MX of microsoft.com, still same problem, so then I checked my box’s and my ADSL modem’s iptables, but no such rule found. So then I called Gautam to know if he is already experiencing this problem. So he also confirmed me the same. Then Edwin suggested me that I should try tcptraceroute to see where packets were being dropped. Following is the stuff which I did:

[wahjava@chatteau ~]$ sudo tcptraceroute smtp.gmail.com -p 25
Password:
traceroute to smtp.gmail.com (72.14.215.109), 30 hops max, 40 byte packets
 1  172.16.0.1 (172.16.0.1)  1.503 ms  2.419 ms  3.376 ms
 2  rasBTNLDel-static-135.215.56.202.mantraonline.com (202.56.215.135)  366.339 ms  367.289 ms  368.254 ms
 3  rasBTNLDel-static-230.215.56.202.mantraonline.com (202.56.215.230)  378.217 ms  380.183 ms  384.148 ms
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  rasBTNLDel-static-162.215.56.202.mantraonline.com (202.56.215.162)  3340.447 ms !X * *
[wahjava@chatteau ~]$ sudo tcptraceroute smtp.gmail.com -p 995
traceroute to smtp.gmail.com (209.85.133.111), 30 hops max, 40 byte packets
 1  172.16.0.1 (172.16.0.1)  1.479 ms  2.408 ms  3.352 ms
 2  rasBTNLDel-static-135.215.56.202.mantraonline.com (202.56.215.135)  20.312 ms  22.271 ms  23.240 ms
 3  rasBTNLDel-static-230.215.56.202.mantraonline.com (202.56.215.230)  33.203 ms  34.168 ms  36.131 ms
 4  rasBTNLDel-static-162.215.56.202.mantraonline.com (202.56.215.162)  48.099 ms  50.066 ms  51.032 ms
 5  203.101.95.181 (203.101.95.181)  52.985 ms  53.949 ms  60.921 ms
 6  203.101.100.29 (203.101.100.29)  84.881 ms  61.776 ms  65.554 ms
 7  203.101.100.237 (203.101.100.237)  99.229 ms  101.843 ms  107.750 ms
 8  202.56.223.29 (202.56.223.29)  103.664 ms  108.346 ms  3062.296 ms
 9  203.208.147.45 (203.208.147.45)  3303.216 ms  303.740 ms  298.521 ms
10  203.208.149.57 (203.208.149.57)  321.219 ms  296.750 ms  297.529 ms
11  * * *
12  209.85.130.6 (209.85.130.6)  337.195 ms  295.753 ms  296.539 ms
13  66.249.95.212 (66.249.95.212)  362.315 ms  352.741 ms  354.526 ms
14  72.14.238.155 (72.14.238.155)  375.188 ms 72.14.239.19 (72.14.239.19)  378.140 ms  386.085 ms
15  216.239.43.13 (216.239.43.13)  379.977 ms 216.239.49.22 (216.239.49.22)  401.926 ms  402.796 ms
16  209.85.133.111 (209.85.133.111)  1969.214 ms  1969.046 ms  1969.025 ms
[wahjava@chatteau ~]$ sudo tcptraceroute smtp.ncr.airtelbroadband.in -p 25
traceroute to smtp.ncr.airtelbroadband.in (202.56.230.30), 30 hops max, 40 byte packets
 1  172.16.0.1 (172.16.0.1)  1.593 ms  2.507 ms  3.457 ms
 2  rasBTNLDel-static-135.215.56.202.mantraonline.com (202.56.215.135)  398.424 ms  399.378 ms  403.343 ms
 3  rasBTNLDel-static-230.215.56.202.mantraonline.com (202.56.215.230)  404.307 ms  406.274 ms  408.237 ms
 4  rasBTNLDel-static-162.215.56.202.mantraonline.com (202.56.215.162)  414.203 ms  416.167 ms  435.135 ms
 5  203.101.95.181 (203.101.95.181)  433.101 ms  434.066 ms  439.032 ms
 6  * * *
 7  smtp.airtelbroadband.in (202.56.230.30)  5374.574 ms  5374.184 ms  5374.113 ms
[wahjava@chatteau ~]$ dig +short smtp.ncr.airtelbroadband.in
202.56.230.27
202.56.230.30
[wahjava@chatteau ~]$ telnet smtp.ncr.airtelbroadband.in smtp
Trying 202.56.230.27...
Connected to smtp.ncr.airtelbroadband.in (202.56.230.27).
Escape character is '^]'.
220 ****************************************************************
^]
telnet> quit
Connection closed.
[wahjava@chatteau ~]$ sudo tcptraceroute smtp.ncr.airtelbroadband.in -p 25
Password:
traceroute to smtp.ncr.airtelbroadband.in (202.56.230.27), 30 hops max, 40 byte packets
 1  172.16.0.1 (172.16.0.1)  1.434 ms  2.346 ms  3.297 ms
 2  rasBTNLDel-static-135.215.56.202.mantraonline.com (202.56.215.135)  263.255 ms  268.210 ms  271.172 ms
 3  rasBTNLDel-static-230.215.56.202.mantraonline.com (202.56.215.230)  270.139 ms  274.102 ms  276.069 ms
 4  rasBTNLDel-static-162.215.56.202.mantraonline.com (202.56.215.162)  280.034 ms  280.991 ms  285.953 ms
 5  203.101.95.181 (203.101.95.181)  287.920 ms  288.886 ms  290.852 ms
 6  203.101.100.198 (203.101.100.198)  291.817 ms  321.753 ms  322.518 ms
 7  smtpout.airtelbroadband.in (202.56.230.27)  973.533 ms  973.181 ms  973.111 ms

As clear from the above dump, that outgoing TCP packets to smtp port are dropped at 202.56.215.162, but 202.56.215.162 allows packets to smtp.ncr.airtelbroadband.in. So, what do you conclude from this ? Anyways, I reported this to their customer care, but customer care representative told me that they’re currently having some problem with some 3rd party websites. And he told me that issue will be resolved tomorrow. Let’s hope it get resolved soon.

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10 Comments »

  1. If I want credit for what I did, then I should give credit to others for what they did :).
    BtW, thanks you told me about a new utility. :)

    Comment by आशीष शुक्ल — 20061209 @ 1809

  2. Hi,

    Having same problem… but finaly my bg brother suggest me try incredimail’ and everythings working just fine… But still outlook/window mail not able to send any mail but can download easily…..

    Comment by Akhil — 20080413 @ 2201

  3. Hey even I’m facing the same problem. Does it work for you now?

    Comment by Emmanuel — 20080418 @ 1228

  4. The problem was there only for few hours. However you can trying doing tcptraceroute to see if you’ve the same problem ? In my case I was able to access Airtel’s SMTP servers but not others, is this also happening with you, hmm..? I think you should report the issue to some technical person at Airtel Customer Care.

    Comment by आशीष शुक्ल — 20080418 @ 1305

  5. same problem for me also , look at this

    sivaji@dappyboy:~/Desktop$ sudo tcptraceroute smtp.gmail.com -p 25
    Selected device eth0, address 192.168.1.2, port 25 for outgoing packets
    Tracing the path to smtp.gmail.com (209.85.147.111) on TCP port 80 (www), 30 hops max
    1 192.168.1.1 1.795 ms 0.763 ms 0.644 ms
    2 ABTS-TN-dynamic-001.48.164.122.airtelbroadband.in (122.164.48.1) 30.483 ms 33.425 ms 29.665 ms
    3 61.246.253.225 28.807 ms 32.974 ms 29.932 ms
    4 61.95.240.129 29.074 ms 28.998 ms 29.673 ms
    5 125.21.167.29 30.549 ms 31.171 ms 29.877 ms
    6 sl-gw39-nyc-10-1.sprintlink.net (160.81.228.73) 251.121 ms 254.199 ms 250.508 ms
    7 sl-bb24-nyc-5-0-0.sprintlink.net (144.232.13.63) 255.950 ms 255.200 ms 255.122 ms
    8 sl-crs2-nyc-0-0-0-0.sprintlink.net (144.232.13.180) 253.033 ms 253.995 ms 250.491 ms
    9 sl-crs1-pen-0-4-5-0.sprintlink.net (144.232.20.142) 257.604 ms 256.976 ms 254.633 ms
    10 sl-bb24-rly-4-0.sprintlink.net (144.232.20.210) 308.911 ms 340.375 ms 414.357 ms
    11 sl-st22-ash-5-0.sprintlink.net (144.232.20.155) 262.331 ms 262.348 ms 259.538 ms
    12 144.223.154.126 271.256 ms 275.056 ms 273.456 ms
    13 209.85.130.18 274.713 ms 275.575 ms 346.772 ms
    14 216.239.46.224 287.571 ms 279.305 ms 280.997 ms
    15 72.14.233.116 321.341 ms 322.798 ms 340.142 ms
    16 72.14.239.12 326.941 ms 327.988 ms 330.723 ms
    17 72.14.233.37 332.323 ms 333.659 ms 329.777 ms
    18 64.233.174.121 329.190 ms 330.348 ms 329.487 ms
    19 209.85.251.166 338.522 ms 341.561 ms 342.873 ms
    20 74.125.28.134 338.999 ms 336.562 ms 339.706 ms
    21 * * *
    22 * * *
    23 * * *
    24 * * *
    25 * * *
    26 * * *
    27 * * *
    28 * * *
    29 * * *
    30 * * *
    Destination not reached

    Comment by sivaji — 20080607 @ 0115

  6. abbe [~] chateau% tcptraceroute -n smtp.gmail.com 25
    Selected device rl0, address 172.16.0.2, port 58087 for outgoing packets
    Tracing the path to smtp.gmail.com (209.85.147.109) on TCP port 25
    (smtp), 30 hops max
    1 172.16.0.3 0.161 ms 0.121 ms 0.112 ms
    2 * * *
    3 122.160.220.246 32.099 ms 29.503 ms 30.511 ms
    4 122.160.220.170 29.041 ms 29.988 ms 30.254 ms
    5 125.19.22.145 29.566 ms 29.751 ms 29.774 ms
    6 125.21.167.29 80.126 ms 79.708 ms 80.538 ms
    7 160.81.228.73 295.363 ms 295.086 ms 296.613 ms
    8 144.232.13.57 296.137 ms 294.570 ms 297.141 ms
    9 144.232.7.102 305.400 ms 399.623 ms 306.985 ms
    10 144.232.7.107 295.332 ms 294.612 ms 297.372 ms
    11 144.232.20.123 302.761 ms 304.229 ms 305.503 ms
    12 144.232.20.210 297.825 ms * *
    13 144.232.20.155 304.614 ms 306.871 ms 305.288 ms
    14 160.81.98.34 307.899 ms 310.173 ms 311.633 ms
    15 209.85.130.18 415.064 ms 319.779 ms 447.346 ms
    16 216.239.46.224 345.952 ms 346.332 ms 345.355 ms
    17 72.14.232.96 372.318 ms 372.163 ms 374.930 ms
    18 66.249.95.210 398.413 ms 396.335 ms 394.614 ms
    19 216.239.48.34 399.632 ms 399.772 ms 399.866 ms
    20 216.239.48.132 384.074 ms 385.710 ms 387.285 ms
    21 216.239.48.137 393.675 ms 394.310 ms 397.167 ms
    22 209.85.251.158 400.379 ms 398.582 ms 395.631 ms
    23 74.125.28.2 389.982 ms 395.841 ms 397.665 ms
    24 209.85.147.109 [open] 392.153 ms 396.338 ms 396.131 ms

    In your case some 74.125.28.134 is dropping packets probably, did you
    tried a telnet to smtp.gmail.com:25, hmm…? Or probably a router is not
    interested in forwarding TTL exceeded ICMP packets. But Airtel is not
    responsible for this :P .

    Comment by आशीष शुक्ल — 20080609 @ 0249

  7. Subject :**Urgent** request My Airtlel Broadband Cannection is immieadly Droping this date.

    Comment by s.p.singh — 20090204 @ 1445

  8. Subject :Urgent request My Airtlel Broadband Cannection is immieadly Droping in this date.

    regar
    s.p.singh
    4072815
    lko

    Comment by s.p.singh — 20090204 @ 1446

  9. Sir,
    My Airtel Broadband connection is urgent drop in this date. my transfer is gorakhpur. urgent immedate this connection is drop.
    In this date not pay other bill. plz disconnet/drop my net connection. urgent.

    Comment by s.p.singh — 20090204 @ 1449

  10. i want to know out look setting for airtel

    Comment by mohan — 20100319 @ 1554


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