RVS4000 PING Issue with certain packet sizes

[cmartin97]

I'm having an issue with my internal LAN connection using a RVS4000 router.  My configuration is basically factory default except I use 192.168.99.1/255.255.255.0 for my network.

If I ping using any packet size up to 1024 I don't have any issues.  ping fails for any packet sizes from 1025 to 1472. 

I thought I had a bad wire or setting on my PC but I've tried multiple ports and multiple PCs on the router.

The command I'm running is ping 192.168.99.1 -l <#bytes>

I've tried this between other nodes on the network and it only seems to fail from the LAN to the RVS4000.

A little more research and my MTU is set at 1500 which means any packet sent with more than 1472 bytes (sans header) will be fragmented.

So it's something between 1K and when packets are fragmented.

UPDATE:  I changed the MTU on the PCs and Laptops on my network to 1052 instead of the default 1500 and that seemed to resolve the issue.

Is there a reason the RVS4000 requires this non-default MTU setting?

[mgierhart]

Chris - Did you ever get an answer on this? I am having the exact same issues; not able to pass a packet size over 1024.. Updated resetting back to factory settings and updating firmware did not fix the issue.

[jasbryan]

HI,

Well when i seen this post , and i had to get an RVS4000 out of stock and test for myself and didn't have the issues explained above. What version of RVS4000 do you guys have? what firmware is it running? I would like to try and replicate in our lab.

Thanks,

Jasbryan

[mgierhart]

We are using the plan RVS4000 and the firmware is v1.3.13.02 15/JUN/2011

I have 2 of these and both having same issue. I am connecting one of

the units on my service bench, from PC start to LAN port.

Reset Router to default factory settings prior to re-flash.

Using ping 192.168.1.1 -l 1024

Anything of 1024 times out.

Mark

[jasbryan]

Mark,

Strange - yeah e-mail me directly would like to get a confirmation file and load it on my lab RVS4000 for testing.

Jasbryan

[cmartin97]

Here is a batch file script I wrote to test this issue  my RVS4000 is at ip 192.168.99.1

@echo off

set pingResult=

FOR /L %%G IN (1000,1,2000) DO (
    ping -n 1 192.168.99.1 -l %%G | find "bytes=" > nul

    if ERRORLEVEL 1 (
       echo ping with %%G bytes - FAIL
    ) else (
       echo ping with %%G bytes - SUCCESS
    )
)

It fails only within a specifc range between 1025 and 1472.  1472 is when the package is fragmented and it succeeeds again  based on a 1500 MTU value.

output:

ping with 1000 bytes - SUCCESS

ping with 1001 bytes - SUCCESS

ping with 1002 bytes - SUCCESS

ping with 1003 bytes - SUCCESS

ping with 1004 bytes - SUCCESS

ping with 1005 bytes - SUCCESS

ping with 1006 bytes - SUCCESS

ping with 1007 bytes - SUCCESS

ping with 1008 bytes - SUCCESS

ping with 1009 bytes - SUCCESS

ping with 1010 bytes - SUCCESS

ping with 1011 bytes - SUCCESS

ping with 1012 bytes - SUCCESS

ping with 1013 bytes - SUCCESS

ping with 1014 bytes - SUCCESS

ping with 1015 bytes - SUCCESS

ping with 1016 bytes - SUCCESS

ping with 1017 bytes - SUCCESS

ping with 1018 bytes - SUCCESS

ping with 1019 bytes - SUCCESS

ping with 1020 bytes - SUCCESS

ping with 1021 bytes - SUCCESS

ping with 1022 bytes - SUCCESS

ping with 1023 bytes - SUCCESS

ping with 1024 bytes - SUCCESS

ping with 1025 bytes - FAIL

ping with 1026 bytes - FAIL

ping with 1027 bytes - FAIL

ping with 1028 bytes - FAIL

ping with 1029 bytes - FAIL

ping with 1030 bytes - FAIL

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ping with 1473 bytes - SUCCESS

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ping with 1786 bytes - SUCCESS

ping with 1787 bytes - SUCCESS

ping with 1788 bytes - SUCCESS

ping with 1789 bytes - SUCCESS

ping with 1790 bytes - SUCCESS

ping with 1791 bytes - SUCCESS

ping with 1792 bytes - SUCCESS

ping with 1793 bytes - SUCCESS

ping with 1794 bytes - SUCCESS

ping with 1795 bytes - SUCCESS

ping with 1796 bytes - SUCCESS

ping with 1797 bytes - SUCCESS

ping with 1798 bytes - SUCCESS

ping with 1799 bytes - SUCCESS

ping with 1800 bytes - SUCCESS

ping with 1801 bytes - SUCCESS

ping with 1802 bytes - SUCCESS

ping with 1803 bytes - SUCCESS

ping with 1804 bytes - SUCCESS

ping with 1805 bytes - SUCCESS

ping with 1806 bytes - SUCCESS

ping with 1807 bytes - SUCCESS

ping with 1808 bytes - SUCCESS

ping with 1809 bytes - SUCCESS

ping with 1810 bytes - SUCCESS

ping with 1811 bytes - SUCCESS

ping with 1812 bytes - SUCCESS

ping with 1813 bytes - SUCCESS

ping with 1814 bytes - SUCCESS

ping with 1815 bytes - SUCCESS

ping with 1816 bytes - SUCCESS

ping with 1817 bytes - SUCCESS

ping with 1818 bytes - SUCCESS

ping with 1819 bytes - SUCCESS

ping with 1820 bytes - SUCCESS

ping with 1821 bytes - SUCCESS

ping with 1822 bytes - SUCCESS

ping with 1823 bytes - SUCCESS

ping with 1824 bytes - SUCCESS

ping with 1825 bytes - SUCCESS

ping with 1826 bytes - SUCCESS

ping with 1827 bytes - SUCCESS

ping with 1828 bytes - SUCCESS

ping with 1829 bytes - SUCCESS

ping with 1830 bytes - SUCCESS

ping with 1831 bytes - SUCCESS

ping with 1832 bytes - SUCCESS

ping with 1833 bytes - SUCCESS

ping with 1834 bytes - SUCCESS

ping with 1835 bytes - SUCCESS

ping with 1836 bytes - SUCCESS

ping with 1837 bytes - SUCCESS

ping with 1838 bytes - SUCCESS

ping with 1839 bytes - SUCCESS

ping with 1840 bytes - SUCCESS

ping with 1841 bytes - SUCCESS

ping with 1842 bytes - SUCCESS

ping with 1843 bytes - SUCCESS

ping with 1844 bytes - SUCCESS

ping with 1845 bytes - SUCCESS

ping with 1846 bytes - SUCCESS

ping with 1847 bytes - SUCCESS

ping with 1848 bytes - SUCCESS

ping with 1849 bytes - SUCCESS

ping with 1850 bytes - SUCCESS

ping with 1851 bytes - SUCCESS

ping with 1852 bytes - SUCCESS

ping with 1853 bytes - SUCCESS

ping with 1854 bytes - SUCCESS

ping with 1855 bytes - SUCCESS

ping with 1856 bytes - SUCCESS

ping with 1857 bytes - SUCCESS

ping with 1858 bytes - SUCCESS

ping with 1859 bytes - SUCCESS

ping with 1860 bytes - SUCCESS

ping with 1861 bytes - SUCCESS

ping with 1862 bytes - SUCCESS

ping with 1863 bytes - SUCCESS

ping with 1864 bytes - SUCCESS

ping with 1865 bytes - SUCCESS

ping with 1866 bytes - SUCCESS

ping with 1867 bytes - SUCCESS

ping with 1868 bytes - SUCCESS

ping with 1869 bytes - SUCCESS

ping with 1870 bytes - SUCCESS

ping with 1871 bytes - SUCCESS

ping with 1872 bytes - SUCCESS

ping with 1873 bytes - SUCCESS

ping with 1874 bytes - SUCCESS

ping with 1875 bytes - SUCCESS

ping with 1876 bytes - SUCCESS

ping with 1877 bytes - SUCCESS

ping with 1878 bytes - SUCCESS

ping with 1879 bytes - SUCCESS

ping with 1880 bytes - SUCCESS

ping with 1881 bytes - SUCCESS

ping with 1882 bytes - SUCCESS

ping with 1883 bytes - SUCCESS

ping with 1884 bytes - SUCCESS

ping with 1885 bytes - SUCCESS

ping with 1886 bytes - SUCCESS

ping with 1887 bytes - SUCCESS

ping with 1888 bytes - SUCCESS

ping with 1889 bytes - SUCCESS

ping with 1890 bytes - SUCCESS

ping with 1891 bytes - SUCCESS

ping with 1892 bytes - SUCCESS

ping with 1893 bytes - SUCCESS

ping with 1894 bytes - SUCCESS

ping with 1895 bytes - SUCCESS

ping with 1896 bytes - SUCCESS

ping with 1897 bytes - SUCCESS

ping with 1898 bytes - SUCCESS

ping with 1899 bytes - SUCCESS

ping with 1900 bytes - SUCCESS

ping with 1901 bytes - SUCCESS

ping with 1902 bytes - SUCCESS

ping with 1903 bytes - SUCCESS

ping with 1904 bytes - SUCCESS

ping with 1905 bytes - SUCCESS

ping with 1906 bytes - SUCCESS

ping with 1907 bytes - SUCCESS

ping with 1908 bytes - SUCCESS

ping with 1909 bytes - SUCCESS

ping with 1910 bytes - SUCCESS

ping with 1911 bytes - SUCCESS

ping with 1912 bytes - SUCCESS

ping with 1913 bytes - SUCCESS

ping with 1914 bytes - SUCCESS

ping with 1915 bytes - SUCCESS

ping with 1916 bytes - SUCCESS

ping with 1917 bytes - SUCCESS

ping with 1918 bytes - SUCCESS

ping with 1919 bytes - SUCCESS

ping with 1920 bytes - SUCCESS

ping with 1921 bytes - SUCCESS

ping with 1922 bytes - SUCCESS

ping with 1923 bytes - SUCCESS

ping with 1924 bytes - SUCCESS

ping with 1925 bytes - SUCCESS

ping with 1926 bytes - SUCCESS

ping with 1927 bytes - SUCCESS

ping with 1928 bytes - SUCCESS

ping with 1929 bytes - SUCCESS

ping with 1930 bytes - SUCCESS

ping with 1931 bytes - SUCCESS

ping with 1932 bytes - SUCCESS

ping with 1933 bytes - SUCCESS

ping with 1934 bytes - SUCCESS

ping with 1935 bytes - SUCCESS

ping with 1936 bytes - SUCCESS

ping with 1937 bytes - SUCCESS

ping with 1938 bytes - SUCCESS

ping with 1939 bytes - SUCCESS

ping with 1940 bytes - SUCCESS

ping with 1941 bytes - SUCCESS

ping with 1942 bytes - SUCCESS

ping with 1943 bytes - SUCCESS

ping with 1944 bytes - SUCCESS

ping with 1945 bytes - SUCCESS

ping with 1946 bytes - SUCCESS

ping with 1947 bytes - SUCCESS

ping with 1948 bytes - SUCCESS

ping with 1949 bytes - SUCCESS

ping with 1950 bytes - SUCCESS

ping with 1951 bytes - SUCCESS

ping with 1952 bytes - SUCCESS

ping with 1953 bytes - SUCCESS

ping with 1954 bytes - SUCCESS

ping with 1955 bytes - SUCCESS

ping with 1956 bytes - SUCCESS

ping with 1957 bytes - SUCCESS

ping with 1958 bytes - SUCCESS

ping with 1959 bytes - SUCCESS

ping with 1960 bytes - SUCCESS

ping with 1961 bytes - SUCCESS

ping with 1962 bytes - SUCCESS

ping with 1963 bytes - SUCCESS

ping with 1964 bytes - SUCCESS

ping with 1965 bytes - SUCCESS

ping with 1966 bytes - SUCCESS

ping with 1967 bytes - SUCCESS

ping with 1968 bytes - SUCCESS

ping with 1969 bytes - SUCCESS

ping with 1970 bytes - SUCCESS

ping with 1971 bytes - SUCCESS

ping with 1972 bytes - SUCCESS

ping with 1973 bytes - SUCCESS

ping with 1974 bytes - SUCCESS

ping with 1975 bytes - SUCCESS

ping with 1976 bytes - SUCCESS

ping with 1977 bytes - SUCCESS

ping with 1978 bytes - SUCCESS

ping with 1979 bytes - SUCCESS

ping with 1980 bytes - SUCCESS

ping with 1981 bytes - SUCCESS

ping with 1982 bytes - SUCCESS

ping with 1983 bytes - SUCCESS

ping with 1984 bytes - SUCCESS

ping with 1985 bytes - SUCCESS

ping with 1986 bytes - SUCCESS

ping with 1987 bytes - SUCCESS

ping with 1988 bytes - SUCCESS

ping with 1989 bytes - SUCCESS

ping with 1990 bytes - SUCCESS

ping with 1991 bytes - SUCCESS

ping with 1992 bytes - SUCCESS

ping with 1993 bytes - SUCCESS

ping with 1994 bytes - SUCCESS

ping with 1995 bytes - SUCCESS

ping with 1996 bytes - SUCCESS

ping with 1997 bytes - SUCCESS

ping with 1998 bytes - SUCCESS

ping with 1999 bytes - SUCCESS

ping with 2000 bytes - SUCCESS

[drugolfsdrugolfs]

Am having the same problem.

When I turn off IPS though the problem is resolved.

[cmartin97]

I can confirm the same behavior as Dru.  I'm using IPS signature 1.5.  The IPS log is reporting OVER_PING_LENGTH as the name of the "attack" that's it's blocking for packets between 1024 and 1500. 

No	Time	Name	Source
1	2012-01-27 10:55:28	OVER_PING_LENGTH	192.168.99.101
2	2012-01-27 10:55:24	OVER_PING_LENGTH	192.168.99.101
3	2012-01-27 10:55:20	OVER_PING_LENGTH	192.168.99.101
4	2012-01-27 10:55:16	OVER_PING_LENGTH	192.168.99.101
5	2012-01-27 10:55:12	OVER_PING_LENGTH	192.168.99.101
6	2012-01-27 10:55:08	OVER_PING_LENGTH	192.168.99.101
7	2012-01-27 10:55:04	OVER_PING_LENGTH	192.168.99.101
8	2012-01-27 10:55:00	OVER_PING_LENGTH	192.168.99.101
9	2012-01-27 10:54:57	OVER_PING_LENGTH	192.168.99.101
10	2012-01-27 10:54:22	OVER_PING_LENGTH	192.168.99.101
11	2012-01-27 10:54:19	OVER_PING_LENGTH	192.168.99.101

Is there a way in the IPS configuration to disable this one signature?

Chris